[ADD] FG-main: Added basic setup

2026-02-25 23:17:08 +01:00 · 2026-02-25 23:17:08 +01:00 · 73cf178e18
commit 73cf178e18
parent d22b12c07f
46 changed files with 11396 additions and 140 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,3 +1,9 @@
 build/bin
 node_modules
 frontend/dist
+*.csv
+*.exe
+*.db
+NUL
+*.db-shm
+*.db-wal
--- a/app.go
+++ b/app.go
@ -2,12 +2,25 @@ package main

 import (
 	"context"
+	"database/sql"
+	"errors"
 	"fmt"
+
+	"fncConvertGui/internal/crypto"
+	"fncConvertGui/internal/database"
+	"fncConvertGui/internal/imports"
+	"fncConvertGui/internal/models"
+	"fncConvertGui/internal/repository"
 )

+const verifyString = "fncConvertGui-verify"
+
 // App struct
 type App struct {
-	ctx context.Context
+	ctx       context.Context
+	db        *sql.DB
+	encryptor *crypto.Encryptor
+	customers *repository.CustomerRepository
 }

 // NewApp creates a new App application struct
@ -21,7 +34,195 @@ func (a *App) startup(ctx context.Context) {
 	a.ctx = ctx
 }

+// shutdown is called when the app is closing.
+func (a *App) shutdown(ctx context.Context) {
+	if a.db != nil {
+		a.db.Close()
+	}
+}
+
 // Greet returns a greeting for the given name
 func (a *App) Greet(name string) string {
 	return fmt.Sprintf("Hello %s, It's show time!", name)
 }
+
+// GetStatus returns the current app state: "disconnected", "locked", or "ready".
+func (a *App) GetStatus() string {
+	if a.db == nil {
+		return "disconnected"
+	}
+	if a.encryptor == nil {
+		return "locked"
+	}
+	return "ready"
+}
+
+// ConnectDatabase opens a SQLite connection and ensures the schema exists.
+func (a *App) ConnectDatabase(dbPath string) error {
+	db, err := database.Open(dbPath)
+	if err != nil {
+		return fmt.Errorf("connect: %w", err)
+	}
+
+	a.db = db
+	if err := a.EnsureSchema(); err != nil {
+		a.db.Close()
+		a.db = nil
+		return fmt.Errorf("schema: %w", err)
+	}
+	return nil
+}
+
+// EnsureSchema creates required tables if they don't exist.
+func (a *App) EnsureSchema() error {
+	_, err := a.db.Exec(`
+		CREATE TABLE IF NOT EXISTS crypto_meta (
+			id INTEGER PRIMARY KEY DEFAULT 1,
+			salt BLOB NOT NULL,
+			verify_blob BLOB,
+			argon2_time INTEGER NOT NULL,
+			argon2_memory INTEGER NOT NULL,
+			argon2_threads INTEGER NOT NULL
+		)`)
+	if err != nil {
+		return fmt.Errorf("create crypto_meta: %w", err)
+	}
+
+	_, err = a.db.Exec(`
+		CREATE TABLE IF NOT EXISTS customers (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			name BLOB NOT NULL,
+			email BLOB NOT NULL,
+			phone BLOB NOT NULL,
+			company TEXT NOT NULL,
+			created_at DATETIME NOT NULL,
+			updated_at DATETIME NOT NULL
+		)`)
+	if err != nil {
+		return fmt.Errorf("create customers: %w", err)
+	}
+	return nil
+}
+
+// InitEncryption sets up field-level encryption using a user passphrase.
+// On first call it generates a salt and stores a verification blob.
+// On subsequent calls it verifies the passphrase against the stored blob.
+func (a *App) InitEncryption(passphrase string) error {
+	if a.db == nil {
+		return errors.New("database not connected")
+	}
+
+	var params crypto.Params
+	var verifyBlob []byte
+	err := a.db.QueryRow(
+		`SELECT salt, argon2_time, argon2_memory, argon2_threads, verify_blob
+		 FROM crypto_meta WHERE id = 1`,
+	).Scan(&params.Salt, &params.Time, &params.Memory, &params.Threads, &verifyBlob)
+
+	firstTime := errors.Is(err, sql.ErrNoRows)
+	if err != nil && !firstTime {
+		return fmt.Errorf("read crypto_meta: %w", err)
+	}
+
+	if firstTime {
+		p, err := crypto.DefaultParams()
+		if err != nil {
+			return fmt.Errorf("default params: %w", err)
+		}
+		params = *p
+
+		key := crypto.DeriveKey(passphrase, &params)
+		enc, err := crypto.NewEncryptor(key)
+		if err != nil {
+			return fmt.Errorf("new encryptor: %w", err)
+		}
+
+		blob, err := enc.Encrypt([]byte(verifyString))
+		if err != nil {
+			return fmt.Errorf("encrypt verify: %w", err)
+		}
+
+		_, err = a.db.Exec(
+			`INSERT INTO crypto_meta (id, salt, argon2_time, argon2_memory, argon2_threads, verify_blob)
+			 VALUES (1, ?, ?, ?, ?, ?)`,
+			params.Salt, params.Time, params.Memory, params.Threads, blob,
+		)
+		if err != nil {
+			return fmt.Errorf("insert crypto_meta: %w", err)
+		}
+
+		a.encryptor = enc
+	} else {
+		key := crypto.DeriveKey(passphrase, &params)
+		enc, err := crypto.NewEncryptor(key)
+		if err != nil {
+			return fmt.Errorf("new encryptor: %w", err)
+		}
+
+		pt, err := enc.Decrypt(verifyBlob)
+		if err != nil {
+			return errors.New("wrong passphrase")
+		}
+		if string(pt) != verifyString {
+			return errors.New("wrong passphrase")
+		}
+
+		a.encryptor = enc
+	}
+
+	a.customers = repository.NewCustomerRepository(a.db, a.encryptor)
+	return nil
+}
+
+func (a *App) GetCustomers() ([]models.CustomerListItem, error) {
+	if a.customers == nil {
+		return nil, errors.New("encryption not initialized")
+	}
+	return a.customers.List()
+}
+
+func (a *App) GetCustomer(id int64) (*models.Customer, error) {
+	if a.customers == nil {
+		return nil, errors.New("encryption not initialized")
+	}
+	return a.customers.GetByID(id)
+}
+
+func (a *App) CreateCustomer(name, email, phone, company string) (int64, error) {
+	if a.customers == nil {
+		return 0, errors.New("encryption not initialized")
+	}
+	c := &models.Customer{
+		Name:    name,
+		Email:   email,
+		Phone:   phone,
+		Company: company,
+	}
+	return a.customers.Create(c)
+}
+
+func (a *App) UpdateCustomer(id int64, name, email, phone, company string) error {
+	if a.customers == nil {
+		return errors.New("encryption not initialized")
+	}
+	c := &models.Customer{
+		ID:      id,
+		Name:    name,
+		Email:   email,
+		Phone:   phone,
+		Company: company,
+	}
+	return a.customers.Update(c)
+}
+
+func (a *App) DeleteCustomer(id int64) error {
+	if a.customers == nil {
+		return errors.New("encryption not initialized")
+	}
+	return a.customers.Delete(id)
+}
+
+// GetImporters returns the list of available importers and their versions.
+func (a *App) GetImporters() []imports.ImporterInfo {
+	return imports.ListImporters()
+}
--- a/frontend/components.json
+++ b/frontend/components.json
@ -0,0 +1,23 @@
+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "new-york",
+  "rsc": false,
+  "tsx": true,
+  "tailwind": {
+    "config": "",
+    "css": "src/style.css",
+    "baseColor": "neutral",
+    "cssVariables": true,
+    "prefix": ""
+  },
+  "iconLibrary": "lucide",
+  "rtl": false,
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils",
+    "ui": "@/components/ui",
+    "lib": "@/lib",
+    "hooks": "@/hooks"
+  },
+  "registries": {}
+}
--- a/frontend/index.html
+++ b/frontend/index.html
@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="en" class="dark">
 <head>
    <meta charset="UTF-8"/>
    <meta content="width=device-width, initial-scale=1.0" name="viewport"/>
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
--- a/frontend/package.json
+++ b/frontend/package.json
@ -9,14 +9,25 @@
    "preview": "vite preview"
  },
  "dependencies": {
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0"
+    "@tanstack/react-query": "^5.64.0",
+    "@tanstack/react-router": "^1.95.0",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^0.575.0",
+    "radix-ui": "^1.4.3",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "tailwind-merge": "^3.5.0"
  },
  "devDependencies": {
-    "@types/react": "^18.0.17",
-    "@types/react-dom": "^18.0.6",
-    "@vitejs/plugin-react": "^2.0.1",
-    "typescript": "^4.6.4",
-    "vite": "^3.0.7"
+    "@tailwindcss/vite": "^4.0.0",
+    "@types/react": "^18.3.0",
+    "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.0",
+    "shadcn": "^3.8.5",
+    "tailwindcss": "^4.0.0",
+    "tw-animate-css": "^1.4.0",
+    "typescript": "^5.7.0",
+    "vite": "^6.1.0"
  }
-}
+}
--- a/frontend/package.json.md5
+++ b/frontend/package.json.md5
@ -0,0 +1 @@
+71302eb7529506753d67cb1c1d6b0ca9
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
@ -1,59 +0,0 @@
-#app {
-    height: 100vh;
-    text-align: center;
-}
-
-#logo {
-    display: block;
-    width: 50%;
-    height: 50%;
-    margin: auto;
-    padding: 10% 0 0;
-    background-position: center;
-    background-repeat: no-repeat;
-    background-size: 100% 100%;
-    background-origin: content-box;
-}
-
-.result {
-    height: 20px;
-    line-height: 20px;
-    margin: 1.5rem auto;
-}
-
-.input-box .btn {
-    width: 60px;
-    height: 30px;
-    line-height: 30px;
-    border-radius: 3px;
-    border: none;
-    margin: 0 0 0 20px;
-    padding: 0 8px;
-    cursor: pointer;
-}
-
-.input-box .btn:hover {
-    background-image: linear-gradient(to top, #cfd9df 0%, #e2ebf0 100%);
-    color: #333333;
-}
-
-.input-box .input {
-    border: none;
-    border-radius: 3px;
-    outline: none;
-    height: 30px;
-    line-height: 30px;
-    padding: 0 10px;
-    background-color: rgba(240, 240, 240, 1);
-    -webkit-font-smoothing: antialiased;
-}
-
-.input-box .input:hover {
-    border: none;
-    background-color: rgba(255, 255, 255, 1);
-}
-
-.input-box .input:focus {
-    border: none;
-    background-color: rgba(255, 255, 255, 1);
-}
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@ -1,28 +1,3 @@
-import {useState} from 'react';
-import logo from './assets/images/logo-universal.png';
-import './App.css';
-import {Greet} from "../wailsjs/go/main/App";
-
-function App() {
-    const [resultText, setResultText] = useState("Please enter your name below 👇");
-    const [name, setName] = useState('');
-    const updateName = (e: any) => setName(e.target.value);
-    const updateResultText = (result: string) => setResultText(result);
-
-    function greet() {
-        Greet(name).then(updateResultText);
-    }
-
-    return (
-        <div id="App">
-            <img src={logo} id="logo" alt="logo"/>
-            <div id="result" className="result">{resultText}</div>
-            <div id="input" className="input-box">
-                <input id="name" className="input" onChange={updateName} autoComplete="off" name="input" type="text"/>
-                <button className="btn" onClick={greet}>Greet</button>
-            </div>
-        </div>
-    )
+export default function App() {
+    return null
 }
-
-export default App
--- a/frontend/src/components/application/sidebar.component.tsx
+++ b/frontend/src/components/application/sidebar.component.tsx
@ -0,0 +1,18 @@
+import { Plus } from "lucide-react"
+import { Sidebar, SidebarContent, SidebarFooter, SidebarGroup, SidebarGroupAction, SidebarGroupContent, SidebarGroupLabel, SidebarHeader, SidebarMenuButton } from "../ui/sidebar"
+
+function ApplicationSidebar() {
+  return (
+    <Sidebar>
+      <SidebarHeader />
+      <SidebarContent>
+        <SidebarMenuButton asChild>
+          <a href="#">Home</a>
+        </SidebarMenuButton>
+      </SidebarContent>
+      <SidebarFooter />
+    </Sidebar>
+  )
+}
+
+export default ApplicationSidebar
--- a/frontend/src/components/ui/button.tsx
+++ b/frontend/src/components/ui/button.tsx
@ -0,0 +1,64 @@
+import * as React from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+import { Slot } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground hover:bg-primary/90",
+        destructive:
+          "bg-destructive text-white hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60",
+        outline:
+          "border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50",
+        secondary:
+          "bg-secondary text-secondary-foreground hover:bg-secondary/80",
+        ghost:
+          "hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
+        link: "text-primary underline-offset-4 hover:underline",
+      },
+      size: {
+        default: "h-9 px-4 py-2 has-[>svg]:px-3",
+        xs: "h-6 gap-1 rounded-md px-2 text-xs has-[>svg]:px-1.5 [&_svg:not([class*='size-'])]:size-3",
+        sm: "h-8 rounded-md gap-1.5 px-3 has-[>svg]:px-2.5",
+        lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
+        icon: "size-9",
+        "icon-xs": "size-6 rounded-md [&_svg:not([class*='size-'])]:size-3",
+        "icon-sm": "size-8",
+        "icon-lg": "size-10",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  }
+)
+
+function Button({
+  className,
+  variant = "default",
+  size = "default",
+  asChild = false,
+  ...props
+}: React.ComponentProps<"button"> &
+  VariantProps<typeof buttonVariants> & {
+    asChild?: boolean
+  }) {
+  const Comp = asChild ? Slot.Root : "button"
+
+  return (
+    <Comp
+      data-slot="button"
+      data-variant={variant}
+      data-size={size}
+      className={cn(buttonVariants({ variant, size, className }))}
+      {...props}
+    />
+  )
+}
+
+export { Button, buttonVariants }
--- a/frontend/src/components/ui/card.tsx
+++ b/frontend/src/components/ui/card.tsx
@ -0,0 +1,92 @@
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+function Card({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card"
+      className={cn(
+        "bg-card text-card-foreground flex flex-col gap-6 rounded-xl border py-6 shadow-sm",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-header"
+      className={cn(
+        "@container/card-header grid auto-rows-min grid-rows-[auto_auto] items-start gap-2 px-6 has-data-[slot=card-action]:grid-cols-[1fr_auto] [.border-b]:pb-6",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardTitle({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-title"
+      className={cn("leading-none font-semibold", className)}
+      {...props}
+    />
+  )
+}
+
+function CardDescription({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-description"
+      className={cn("text-muted-foreground text-sm", className)}
+      {...props}
+    />
+  )
+}
+
+function CardAction({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-action"
+      className={cn(
+        "col-start-2 row-span-2 row-start-1 self-start justify-self-end",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardContent({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-content"
+      className={cn("px-6", className)}
+      {...props}
+    />
+  )
+}
+
+function CardFooter({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-footer"
+      className={cn("flex items-center px-6 [.border-t]:pt-6", className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  Card,
+  CardHeader,
+  CardFooter,
+  CardTitle,
+  CardAction,
+  CardDescription,
+  CardContent,
+}
--- a/frontend/src/components/ui/input.tsx
+++ b/frontend/src/components/ui/input.tsx
@ -0,0 +1,21 @@
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+function Input({ className, type, ...props }: React.ComponentProps<"input">) {
+  return (
+    <input
+      type={type}
+      data-slot="input"
+      className={cn(
+        "file:text-foreground placeholder:text-muted-foreground selection:bg-primary selection:text-primary-foreground dark:bg-input/30 border-input h-9 w-full min-w-0 rounded-md border bg-transparent px-3 py-1 text-base shadow-xs transition-[color,box-shadow] outline-none file:inline-flex file:h-7 file:border-0 file:bg-transparent file:text-sm file:font-medium disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
+        "focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]",
+        "aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Input }
--- a/frontend/src/components/ui/label.tsx
+++ b/frontend/src/components/ui/label.tsx
@ -0,0 +1,22 @@
+import * as React from "react"
+import { Label as LabelPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function Label({
+  className,
+  ...props
+}: React.ComponentProps<typeof LabelPrimitive.Root>) {
+  return (
+    <LabelPrimitive.Root
+      data-slot="label"
+      className={cn(
+        "flex items-center gap-2 text-sm leading-none font-medium select-none group-data-[disabled=true]:pointer-events-none group-data-[disabled=true]:opacity-50 peer-disabled:cursor-not-allowed peer-disabled:opacity-50",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Label }
--- a/frontend/src/components/ui/select.tsx
+++ b/frontend/src/components/ui/select.tsx
@ -0,0 +1,188 @@
+import * as React from "react"
+import { CheckIcon, ChevronDownIcon, ChevronUpIcon } from "lucide-react"
+import { Select as SelectPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function Select({
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Root>) {
+  return <SelectPrimitive.Root data-slot="select" {...props} />
+}
+
+function SelectGroup({
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Group>) {
+  return <SelectPrimitive.Group data-slot="select-group" {...props} />
+}
+
+function SelectValue({
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Value>) {
+  return <SelectPrimitive.Value data-slot="select-value" {...props} />
+}
+
+function SelectTrigger({
+  className,
+  size = "default",
+  children,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Trigger> & {
+  size?: "sm" | "default"
+}) {
+  return (
+    <SelectPrimitive.Trigger
+      data-slot="select-trigger"
+      data-size={size}
+      className={cn(
+        "border-input data-[placeholder]:text-muted-foreground [&_svg:not([class*='text-'])]:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 dark:hover:bg-input/50 flex w-fit items-center justify-between gap-2 rounded-md border bg-transparent px-3 py-2 text-sm whitespace-nowrap shadow-xs transition-[color,box-shadow] outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 data-[size=default]:h-9 data-[size=sm]:h-8 *:data-[slot=select-value]:line-clamp-1 *:data-[slot=select-value]:flex *:data-[slot=select-value]:items-center *:data-[slot=select-value]:gap-2 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        className
+      )}
+      {...props}
+    >
+      {children}
+      <SelectPrimitive.Icon asChild>
+        <ChevronDownIcon className="size-4 opacity-50" />
+      </SelectPrimitive.Icon>
+    </SelectPrimitive.Trigger>
+  )
+}
+
+function SelectContent({
+  className,
+  children,
+  position = "item-aligned",
+  align = "center",
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Content>) {
+  return (
+    <SelectPrimitive.Portal>
+      <SelectPrimitive.Content
+        data-slot="select-content"
+        className={cn(
+          "bg-popover text-popover-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 relative z-50 max-h-(--radix-select-content-available-height) min-w-[8rem] origin-(--radix-select-content-transform-origin) overflow-x-hidden overflow-y-auto rounded-md border shadow-md",
+          position === "popper" &&
+            "data-[side=bottom]:translate-y-1 data-[side=left]:-translate-x-1 data-[side=right]:translate-x-1 data-[side=top]:-translate-y-1",
+          className
+        )}
+        position={position}
+        align={align}
+        {...props}
+      >
+        <SelectScrollUpButton />
+        <SelectPrimitive.Viewport
+          className={cn(
+            "p-1",
+            position === "popper" &&
+              "h-[var(--radix-select-trigger-height)] w-full min-w-[var(--radix-select-trigger-width)] scroll-my-1"
+          )}
+        >
+          {children}
+        </SelectPrimitive.Viewport>
+        <SelectScrollDownButton />
+      </SelectPrimitive.Content>
+    </SelectPrimitive.Portal>
+  )
+}
+
+function SelectLabel({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Label>) {
+  return (
+    <SelectPrimitive.Label
+      data-slot="select-label"
+      className={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
+      {...props}
+    />
+  )
+}
+
+function SelectItem({
+  className,
+  children,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Item>) {
+  return (
+    <SelectPrimitive.Item
+      data-slot="select-item"
+      className={cn(
+        "focus:bg-accent focus:text-accent-foreground [&_svg:not([class*='text-'])]:text-muted-foreground relative flex w-full cursor-default items-center gap-2 rounded-sm py-1.5 pr-8 pl-2 text-sm outline-hidden select-none data-[disabled]:pointer-events-none data-[disabled]:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4 *:[span]:last:flex *:[span]:last:items-center *:[span]:last:gap-2",
+        className
+      )}
+      {...props}
+    >
+      <span
+        data-slot="select-item-indicator"
+        className="absolute right-2 flex size-3.5 items-center justify-center"
+      >
+        <SelectPrimitive.ItemIndicator>
+          <CheckIcon className="size-4" />
+        </SelectPrimitive.ItemIndicator>
+      </span>
+      <SelectPrimitive.ItemText>{children}</SelectPrimitive.ItemText>
+    </SelectPrimitive.Item>
+  )
+}
+
+function SelectSeparator({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Separator>) {
+  return (
+    <SelectPrimitive.Separator
+      data-slot="select-separator"
+      className={cn("bg-border pointer-events-none -mx-1 my-1 h-px", className)}
+      {...props}
+    />
+  )
+}
+
+function SelectScrollUpButton({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.ScrollUpButton>) {
+  return (
+    <SelectPrimitive.ScrollUpButton
+      data-slot="select-scroll-up-button"
+      className={cn(
+        "flex cursor-default items-center justify-center py-1",
+        className
+      )}
+      {...props}
+    >
+      <ChevronUpIcon className="size-4" />
+    </SelectPrimitive.ScrollUpButton>
+  )
+}
+
+function SelectScrollDownButton({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.ScrollDownButton>) {
+  return (
+    <SelectPrimitive.ScrollDownButton
+      data-slot="select-scroll-down-button"
+      className={cn(
+        "flex cursor-default items-center justify-center py-1",
+        className
+      )}
+      {...props}
+    >
+      <ChevronDownIcon className="size-4" />
+    </SelectPrimitive.ScrollDownButton>
+  )
+}
+
+export {
+  Select,
+  SelectContent,
+  SelectGroup,
+  SelectItem,
+  SelectLabel,
+  SelectScrollDownButton,
+  SelectScrollUpButton,
+  SelectSeparator,
+  SelectTrigger,
+  SelectValue,
+}
--- a/frontend/src/components/ui/separator.tsx
+++ b/frontend/src/components/ui/separator.tsx
@ -0,0 +1,26 @@
+import * as React from "react"
+import { Separator as SeparatorPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function Separator({
+  className,
+  orientation = "horizontal",
+  decorative = true,
+  ...props
+}: React.ComponentProps<typeof SeparatorPrimitive.Root>) {
+  return (
+    <SeparatorPrimitive.Root
+      data-slot="separator"
+      decorative={decorative}
+      orientation={orientation}
+      className={cn(
+        "bg-border shrink-0 data-[orientation=horizontal]:h-px data-[orientation=horizontal]:w-full data-[orientation=vertical]:h-full data-[orientation=vertical]:w-px",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Separator }
--- a/frontend/src/components/ui/sheet.tsx
+++ b/frontend/src/components/ui/sheet.tsx
@ -0,0 +1,143 @@
+"use client"
+
+import * as React from "react"
+import { XIcon } from "lucide-react"
+import { Dialog as SheetPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function Sheet({ ...props }: React.ComponentProps<typeof SheetPrimitive.Root>) {
+  return <SheetPrimitive.Root data-slot="sheet" {...props} />
+}
+
+function SheetTrigger({
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Trigger>) {
+  return <SheetPrimitive.Trigger data-slot="sheet-trigger" {...props} />
+}
+
+function SheetClose({
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Close>) {
+  return <SheetPrimitive.Close data-slot="sheet-close" {...props} />
+}
+
+function SheetPortal({
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Portal>) {
+  return <SheetPrimitive.Portal data-slot="sheet-portal" {...props} />
+}
+
+function SheetOverlay({
+  className,
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Overlay>) {
+  return (
+    <SheetPrimitive.Overlay
+      data-slot="sheet-overlay"
+      className={cn(
+        "data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 fixed inset-0 z-50 bg-black/50",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SheetContent({
+  className,
+  children,
+  side = "right",
+  showCloseButton = true,
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Content> & {
+  side?: "top" | "right" | "bottom" | "left"
+  showCloseButton?: boolean
+}) {
+  return (
+    <SheetPortal>
+      <SheetOverlay />
+      <SheetPrimitive.Content
+        data-slot="sheet-content"
+        className={cn(
+          "bg-background data-[state=open]:animate-in data-[state=closed]:animate-out fixed z-50 flex flex-col gap-4 shadow-lg transition ease-in-out data-[state=closed]:duration-300 data-[state=open]:duration-500",
+          side === "right" &&
+            "data-[state=closed]:slide-out-to-right data-[state=open]:slide-in-from-right inset-y-0 right-0 h-full w-3/4 border-l sm:max-w-sm",
+          side === "left" &&
+            "data-[state=closed]:slide-out-to-left data-[state=open]:slide-in-from-left inset-y-0 left-0 h-full w-3/4 border-r sm:max-w-sm",
+          side === "top" &&
+            "data-[state=closed]:slide-out-to-top data-[state=open]:slide-in-from-top inset-x-0 top-0 h-auto border-b",
+          side === "bottom" &&
+            "data-[state=closed]:slide-out-to-bottom data-[state=open]:slide-in-from-bottom inset-x-0 bottom-0 h-auto border-t",
+          className
+        )}
+        {...props}
+      >
+        {children}
+        {showCloseButton && (
+          <SheetPrimitive.Close className="ring-offset-background focus:ring-ring data-[state=open]:bg-secondary absolute top-4 right-4 rounded-xs opacity-70 transition-opacity hover:opacity-100 focus:ring-2 focus:ring-offset-2 focus:outline-hidden disabled:pointer-events-none">
+            <XIcon className="size-4" />
+            <span className="sr-only">Close</span>
+          </SheetPrimitive.Close>
+        )}
+      </SheetPrimitive.Content>
+    </SheetPortal>
+  )
+}
+
+function SheetHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sheet-header"
+      className={cn("flex flex-col gap-1.5 p-4", className)}
+      {...props}
+    />
+  )
+}
+
+function SheetFooter({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sheet-footer"
+      className={cn("mt-auto flex flex-col gap-2 p-4", className)}
+      {...props}
+    />
+  )
+}
+
+function SheetTitle({
+  className,
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Title>) {
+  return (
+    <SheetPrimitive.Title
+      data-slot="sheet-title"
+      className={cn("text-foreground font-semibold", className)}
+      {...props}
+    />
+  )
+}
+
+function SheetDescription({
+  className,
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Description>) {
+  return (
+    <SheetPrimitive.Description
+      data-slot="sheet-description"
+      className={cn("text-muted-foreground text-sm", className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  Sheet,
+  SheetTrigger,
+  SheetClose,
+  SheetContent,
+  SheetHeader,
+  SheetFooter,
+  SheetTitle,
+  SheetDescription,
+}
--- a/frontend/src/components/ui/sidebar.tsx
+++ b/frontend/src/components/ui/sidebar.tsx
@ -0,0 +1,726 @@
+"use client"
+
+import * as React from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+import { PanelLeftIcon } from "lucide-react"
+import { Slot } from "radix-ui"
+
+import { useIsMobile } from "@/hooks/use-mobile"
+import { cn } from "@/lib/utils"
+import { Button } from "@/components/ui/button"
+import { Input } from "@/components/ui/input"
+import { Separator } from "@/components/ui/separator"
+import {
+  Sheet,
+  SheetContent,
+  SheetDescription,
+  SheetHeader,
+  SheetTitle,
+} from "@/components/ui/sheet"
+import { Skeleton } from "@/components/ui/skeleton"
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipProvider,
+  TooltipTrigger,
+} from "@/components/ui/tooltip"
+
+const SIDEBAR_COOKIE_NAME = "sidebar_state"
+const SIDEBAR_COOKIE_MAX_AGE = 60 * 60 * 24 * 7
+const SIDEBAR_WIDTH = "16rem"
+const SIDEBAR_WIDTH_MOBILE = "18rem"
+const SIDEBAR_WIDTH_ICON = "3rem"
+const SIDEBAR_KEYBOARD_SHORTCUT = "b"
+
+type SidebarContextProps = {
+  state: "expanded" | "collapsed"
+  open: boolean
+  setOpen: (open: boolean) => void
+  openMobile: boolean
+  setOpenMobile: (open: boolean) => void
+  isMobile: boolean
+  toggleSidebar: () => void
+}
+
+const SidebarContext = React.createContext<SidebarContextProps | null>(null)
+
+function useSidebar() {
+  const context = React.useContext(SidebarContext)
+  if (!context) {
+    throw new Error("useSidebar must be used within a SidebarProvider.")
+  }
+
+  return context
+}
+
+function SidebarProvider({
+  defaultOpen = true,
+  open: openProp,
+  onOpenChange: setOpenProp,
+  className,
+  style,
+  children,
+  ...props
+}: React.ComponentProps<"div"> & {
+  defaultOpen?: boolean
+  open?: boolean
+  onOpenChange?: (open: boolean) => void
+}) {
+  const isMobile = useIsMobile()
+  const [openMobile, setOpenMobile] = React.useState(false)
+
+  // This is the internal state of the sidebar.
+  // We use openProp and setOpenProp for control from outside the component.
+  const [_open, _setOpen] = React.useState(defaultOpen)
+  const open = openProp ?? _open
+  const setOpen = React.useCallback(
+    (value: boolean | ((value: boolean) => boolean)) => {
+      const openState = typeof value === "function" ? value(open) : value
+      if (setOpenProp) {
+        setOpenProp(openState)
+      } else {
+        _setOpen(openState)
+      }
+
+      // This sets the cookie to keep the sidebar state.
+      document.cookie = `${SIDEBAR_COOKIE_NAME}=${openState}; path=/; max-age=${SIDEBAR_COOKIE_MAX_AGE}`
+    },
+    [setOpenProp, open]
+  )
+
+  // Helper to toggle the sidebar.
+  const toggleSidebar = React.useCallback(() => {
+    return isMobile ? setOpenMobile((open) => !open) : setOpen((open) => !open)
+  }, [isMobile, setOpen, setOpenMobile])
+
+  // Adds a keyboard shortcut to toggle the sidebar.
+  React.useEffect(() => {
+    const handleKeyDown = (event: KeyboardEvent) => {
+      if (
+        event.key === SIDEBAR_KEYBOARD_SHORTCUT &&
+        (event.metaKey || event.ctrlKey)
+      ) {
+        event.preventDefault()
+        toggleSidebar()
+      }
+    }
+
+    window.addEventListener("keydown", handleKeyDown)
+    return () => window.removeEventListener("keydown", handleKeyDown)
+  }, [toggleSidebar])
+
+  // We add a state so that we can do data-state="expanded" or "collapsed".
+  // This makes it easier to style the sidebar with Tailwind classes.
+  const state = open ? "expanded" : "collapsed"
+
+  const contextValue = React.useMemo<SidebarContextProps>(
+    () => ({
+      state,
+      open,
+      setOpen,
+      isMobile,
+      openMobile,
+      setOpenMobile,
+      toggleSidebar,
+    }),
+    [state, open, setOpen, isMobile, openMobile, setOpenMobile, toggleSidebar]
+  )
+
+  return (
+    <SidebarContext.Provider value={contextValue}>
+      <TooltipProvider delayDuration={0}>
+        <div
+          data-slot="sidebar-wrapper"
+          style={
+            {
+              "--sidebar-width": SIDEBAR_WIDTH,
+              "--sidebar-width-icon": SIDEBAR_WIDTH_ICON,
+              ...style,
+            } as React.CSSProperties
+          }
+          className={cn(
+            "group/sidebar-wrapper has-data-[variant=inset]:bg-sidebar flex min-h-svh w-full",
+            className
+          )}
+          {...props}
+        >
+          {children}
+        </div>
+      </TooltipProvider>
+    </SidebarContext.Provider>
+  )
+}
+
+function Sidebar({
+  side = "left",
+  variant = "sidebar",
+  collapsible = "offcanvas",
+  className,
+  children,
+  ...props
+}: React.ComponentProps<"div"> & {
+  side?: "left" | "right"
+  variant?: "sidebar" | "floating" | "inset"
+  collapsible?: "offcanvas" | "icon" | "none"
+}) {
+  const { isMobile, state, openMobile, setOpenMobile } = useSidebar()
+
+  if (collapsible === "none") {
+    return (
+      <div
+        data-slot="sidebar"
+        className={cn(
+          "bg-sidebar text-sidebar-foreground flex h-full w-(--sidebar-width) flex-col",
+          className
+        )}
+        {...props}
+      >
+        {children}
+      </div>
+    )
+  }
+
+  if (isMobile) {
+    return (
+      <Sheet open={openMobile} onOpenChange={setOpenMobile} {...props}>
+        <SheetContent
+          data-sidebar="sidebar"
+          data-slot="sidebar"
+          data-mobile="true"
+          className="bg-sidebar text-sidebar-foreground w-(--sidebar-width) p-0 [&>button]:hidden"
+          style={
+            {
+              "--sidebar-width": SIDEBAR_WIDTH_MOBILE,
+            } as React.CSSProperties
+          }
+          side={side}
+        >
+          <SheetHeader className="sr-only">
+            <SheetTitle>Sidebar</SheetTitle>
+            <SheetDescription>Displays the mobile sidebar.</SheetDescription>
+          </SheetHeader>
+          <div className="flex h-full w-full flex-col">{children}</div>
+        </SheetContent>
+      </Sheet>
+    )
+  }
+
+  return (
+    <div
+      className="group peer text-sidebar-foreground hidden md:block"
+      data-state={state}
+      data-collapsible={state === "collapsed" ? collapsible : ""}
+      data-variant={variant}
+      data-side={side}
+      data-slot="sidebar"
+    >
+      {/* This is what handles the sidebar gap on desktop */}
+      <div
+        data-slot="sidebar-gap"
+        className={cn(
+          "relative w-(--sidebar-width) bg-transparent transition-[width] duration-200 ease-linear",
+          "group-data-[collapsible=offcanvas]:w-0",
+          "group-data-[side=right]:rotate-180",
+          variant === "floating" || variant === "inset"
+            ? "group-data-[collapsible=icon]:w-[calc(var(--sidebar-width-icon)+(--spacing(4)))]"
+            : "group-data-[collapsible=icon]:w-(--sidebar-width-icon)"
+        )}
+      />
+      <div
+        data-slot="sidebar-container"
+        className={cn(
+          "fixed inset-y-0 z-10 hidden h-svh w-(--sidebar-width) transition-[left,right,width] duration-200 ease-linear md:flex",
+          side === "left"
+            ? "left-0 group-data-[collapsible=offcanvas]:left-[calc(var(--sidebar-width)*-1)]"
+            : "right-0 group-data-[collapsible=offcanvas]:right-[calc(var(--sidebar-width)*-1)]",
+          // Adjust the padding for floating and inset variants.
+          variant === "floating" || variant === "inset"
+            ? "p-2 group-data-[collapsible=icon]:w-[calc(var(--sidebar-width-icon)+(--spacing(4))+2px)]"
+            : "group-data-[collapsible=icon]:w-(--sidebar-width-icon) group-data-[side=left]:border-r group-data-[side=right]:border-l",
+          className
+        )}
+        {...props}
+      >
+        <div
+          data-sidebar="sidebar"
+          data-slot="sidebar-inner"
+          className="bg-sidebar group-data-[variant=floating]:border-sidebar-border flex h-full w-full flex-col group-data-[variant=floating]:rounded-lg group-data-[variant=floating]:border group-data-[variant=floating]:shadow-sm"
+        >
+          {children}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+function SidebarTrigger({
+  className,
+  onClick,
+  ...props
+}: React.ComponentProps<typeof Button>) {
+  const { toggleSidebar } = useSidebar()
+
+  return (
+    <Button
+      data-sidebar="trigger"
+      data-slot="sidebar-trigger"
+      variant="ghost"
+      size="icon"
+      className={cn("size-7", className)}
+      onClick={(event) => {
+        onClick?.(event)
+        toggleSidebar()
+      }}
+      {...props}
+    >
+      <PanelLeftIcon />
+      <span className="sr-only">Toggle Sidebar</span>
+    </Button>
+  )
+}
+
+function SidebarRail({ className, ...props }: React.ComponentProps<"button">) {
+  const { toggleSidebar } = useSidebar()
+
+  return (
+    <button
+      data-sidebar="rail"
+      data-slot="sidebar-rail"
+      aria-label="Toggle Sidebar"
+      tabIndex={-1}
+      onClick={toggleSidebar}
+      title="Toggle Sidebar"
+      className={cn(
+        "hover:after:bg-sidebar-border absolute inset-y-0 z-20 hidden w-4 -translate-x-1/2 transition-all ease-linear group-data-[side=left]:-right-4 group-data-[side=right]:left-0 after:absolute after:inset-y-0 after:left-1/2 after:w-[2px] sm:flex",
+        "in-data-[side=left]:cursor-w-resize in-data-[side=right]:cursor-e-resize",
+        "[[data-side=left][data-state=collapsed]_&]:cursor-e-resize [[data-side=right][data-state=collapsed]_&]:cursor-w-resize",
+        "hover:group-data-[collapsible=offcanvas]:bg-sidebar group-data-[collapsible=offcanvas]:translate-x-0 group-data-[collapsible=offcanvas]:after:left-full",
+        "[[data-side=left][data-collapsible=offcanvas]_&]:-right-2",
+        "[[data-side=right][data-collapsible=offcanvas]_&]:-left-2",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SidebarInset({ className, ...props }: React.ComponentProps<"main">) {
+  return (
+    <main
+      data-slot="sidebar-inset"
+      className={cn(
+        "bg-background relative flex w-full flex-1 flex-col",
+        "md:peer-data-[variant=inset]:m-2 md:peer-data-[variant=inset]:ml-0 md:peer-data-[variant=inset]:rounded-xl md:peer-data-[variant=inset]:shadow-sm md:peer-data-[variant=inset]:peer-data-[state=collapsed]:ml-2",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SidebarInput({
+  className,
+  ...props
+}: React.ComponentProps<typeof Input>) {
+  return (
+    <Input
+      data-slot="sidebar-input"
+      data-sidebar="input"
+      className={cn("bg-background h-8 w-full shadow-none", className)}
+      {...props}
+    />
+  )
+}
+
+function SidebarHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sidebar-header"
+      data-sidebar="header"
+      className={cn("flex flex-col gap-2 p-2", className)}
+      {...props}
+    />
+  )
+}
+
+function SidebarFooter({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sidebar-footer"
+      data-sidebar="footer"
+      className={cn("flex flex-col gap-2 p-2", className)}
+      {...props}
+    />
+  )
+}
+
+function SidebarSeparator({
+  className,
+  ...props
+}: React.ComponentProps<typeof Separator>) {
+  return (
+    <Separator
+      data-slot="sidebar-separator"
+      data-sidebar="separator"
+      className={cn("bg-sidebar-border mx-2 w-auto", className)}
+      {...props}
+    />
+  )
+}
+
+function SidebarContent({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sidebar-content"
+      data-sidebar="content"
+      className={cn(
+        "flex min-h-0 flex-1 flex-col gap-2 overflow-auto group-data-[collapsible=icon]:overflow-hidden",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SidebarGroup({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sidebar-group"
+      data-sidebar="group"
+      className={cn("relative flex w-full min-w-0 flex-col p-2", className)}
+      {...props}
+    />
+  )
+}
+
+function SidebarGroupLabel({
+  className,
+  asChild = false,
+  ...props
+}: React.ComponentProps<"div"> & { asChild?: boolean }) {
+  const Comp = asChild ? Slot.Root : "div"
+
+  return (
+    <Comp
+      data-slot="sidebar-group-label"
+      data-sidebar="group-label"
+      className={cn(
+        "text-sidebar-foreground/70 ring-sidebar-ring flex h-8 shrink-0 items-center rounded-md px-2 text-xs font-medium outline-hidden transition-[margin,opacity] duration-200 ease-linear focus-visible:ring-2 [&>svg]:size-4 [&>svg]:shrink-0",
+        "group-data-[collapsible=icon]:-mt-8 group-data-[collapsible=icon]:opacity-0",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SidebarGroupAction({
+  className,
+  asChild = false,
+  ...props
+}: React.ComponentProps<"button"> & { asChild?: boolean }) {
+  const Comp = asChild ? Slot.Root : "button"
+
+  return (
+    <Comp
+      data-slot="sidebar-group-action"
+      data-sidebar="group-action"
+      className={cn(
+        "text-sidebar-foreground ring-sidebar-ring hover:bg-sidebar-accent hover:text-sidebar-accent-foreground absolute top-3.5 right-3 flex aspect-square w-5 items-center justify-center rounded-md p-0 outline-hidden transition-transform focus-visible:ring-2 [&>svg]:size-4 [&>svg]:shrink-0",
+        // Increases the hit area of the button on mobile.
+        "after:absolute after:-inset-2 md:after:hidden",
+        "group-data-[collapsible=icon]:hidden",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SidebarGroupContent({
+  className,
+  ...props
+}: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sidebar-group-content"
+      data-sidebar="group-content"
+      className={cn("w-full text-sm", className)}
+      {...props}
+    />
+  )
+}
+
+function SidebarMenu({ className, ...props }: React.ComponentProps<"ul">) {
+  return (
+    <ul
+      data-slot="sidebar-menu"
+      data-sidebar="menu"
+      className={cn("flex w-full min-w-0 flex-col gap-1", className)}
+      {...props}
+    />
+  )
+}
+
+function SidebarMenuItem({ className, ...props }: React.ComponentProps<"li">) {
+  return (
+    <li
+      data-slot="sidebar-menu-item"
+      data-sidebar="menu-item"
+      className={cn("group/menu-item relative", className)}
+      {...props}
+    />
+  )
+}
+
+const sidebarMenuButtonVariants = cva(
+  "peer/menu-button flex w-full items-center gap-2 overflow-hidden rounded-md p-2 text-left text-sm outline-hidden ring-sidebar-ring transition-[width,height,padding] hover:bg-sidebar-accent hover:text-sidebar-accent-foreground focus-visible:ring-2 active:bg-sidebar-accent active:text-sidebar-accent-foreground disabled:pointer-events-none disabled:opacity-50 group-has-data-[sidebar=menu-action]/menu-item:pr-8 aria-disabled:pointer-events-none aria-disabled:opacity-50 data-[active=true]:bg-sidebar-accent data-[active=true]:font-medium data-[active=true]:text-sidebar-accent-foreground data-[state=open]:hover:bg-sidebar-accent data-[state=open]:hover:text-sidebar-accent-foreground group-data-[collapsible=icon]:size-8! group-data-[collapsible=icon]:p-2! [&>span:last-child]:truncate [&>svg]:size-4 [&>svg]:shrink-0",
+  {
+    variants: {
+      variant: {
+        default: "hover:bg-sidebar-accent hover:text-sidebar-accent-foreground",
+        outline:
+          "bg-background shadow-[0_0_0_1px_hsl(var(--sidebar-border))] hover:bg-sidebar-accent hover:text-sidebar-accent-foreground hover:shadow-[0_0_0_1px_hsl(var(--sidebar-accent))]",
+      },
+      size: {
+        default: "h-8 text-sm",
+        sm: "h-7 text-xs",
+        lg: "h-12 text-sm group-data-[collapsible=icon]:p-0!",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  }
+)
+
+function SidebarMenuButton({
+  asChild = false,
+  isActive = false,
+  variant = "default",
+  size = "default",
+  tooltip,
+  className,
+  ...props
+}: React.ComponentProps<"button"> & {
+  asChild?: boolean
+  isActive?: boolean
+  tooltip?: string | React.ComponentProps<typeof TooltipContent>
+} & VariantProps<typeof sidebarMenuButtonVariants>) {
+  const Comp = asChild ? Slot.Root : "button"
+  const { isMobile, state } = useSidebar()
+
+  const button = (
+    <Comp
+      data-slot="sidebar-menu-button"
+      data-sidebar="menu-button"
+      data-size={size}
+      data-active={isActive}
+      className={cn(sidebarMenuButtonVariants({ variant, size }), className)}
+      {...props}
+    />
+  )
+
+  if (!tooltip) {
+    return button
+  }
+
+  if (typeof tooltip === "string") {
+    tooltip = {
+      children: tooltip,
+    }
+  }
+
+  return (
+    <Tooltip>
+      <TooltipTrigger asChild>{button}</TooltipTrigger>
+      <TooltipContent
+        side="right"
+        align="center"
+        hidden={state !== "collapsed" || isMobile}
+        {...tooltip}
+      />
+    </Tooltip>
+  )
+}
+
+function SidebarMenuAction({
+  className,
+  asChild = false,
+  showOnHover = false,
+  ...props
+}: React.ComponentProps<"button"> & {
+  asChild?: boolean
+  showOnHover?: boolean
+}) {
+  const Comp = asChild ? Slot.Root : "button"
+
+  return (
+    <Comp
+      data-slot="sidebar-menu-action"
+      data-sidebar="menu-action"
+      className={cn(
+        "text-sidebar-foreground ring-sidebar-ring hover:bg-sidebar-accent hover:text-sidebar-accent-foreground peer-hover/menu-button:text-sidebar-accent-foreground absolute top-1.5 right-1 flex aspect-square w-5 items-center justify-center rounded-md p-0 outline-hidden transition-transform focus-visible:ring-2 [&>svg]:size-4 [&>svg]:shrink-0",
+        // Increases the hit area of the button on mobile.
+        "after:absolute after:-inset-2 md:after:hidden",
+        "peer-data-[size=sm]/menu-button:top-1",
+        "peer-data-[size=default]/menu-button:top-1.5",
+        "peer-data-[size=lg]/menu-button:top-2.5",
+        "group-data-[collapsible=icon]:hidden",
+        showOnHover &&
+          "peer-data-[active=true]/menu-button:text-sidebar-accent-foreground group-focus-within/menu-item:opacity-100 group-hover/menu-item:opacity-100 data-[state=open]:opacity-100 md:opacity-0",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SidebarMenuBadge({
+  className,
+  ...props
+}: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sidebar-menu-badge"
+      data-sidebar="menu-badge"
+      className={cn(
+        "text-sidebar-foreground pointer-events-none absolute right-1 flex h-5 min-w-5 items-center justify-center rounded-md px-1 text-xs font-medium tabular-nums select-none",
+        "peer-hover/menu-button:text-sidebar-accent-foreground peer-data-[active=true]/menu-button:text-sidebar-accent-foreground",
+        "peer-data-[size=sm]/menu-button:top-1",
+        "peer-data-[size=default]/menu-button:top-1.5",
+        "peer-data-[size=lg]/menu-button:top-2.5",
+        "group-data-[collapsible=icon]:hidden",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SidebarMenuSkeleton({
+  className,
+  showIcon = false,
+  ...props
+}: React.ComponentProps<"div"> & {
+  showIcon?: boolean
+}) {
+  // Random width between 50 to 90%.
+  const width = React.useMemo(() => {
+    return `${Math.floor(Math.random() * 40) + 50}%`
+  }, [])
+
+  return (
+    <div
+      data-slot="sidebar-menu-skeleton"
+      data-sidebar="menu-skeleton"
+      className={cn("flex h-8 items-center gap-2 rounded-md px-2", className)}
+      {...props}
+    >
+      {showIcon && (
+        <Skeleton
+          className="size-4 rounded-md"
+          data-sidebar="menu-skeleton-icon"
+        />
+      )}
+      <Skeleton
+        className="h-4 max-w-(--skeleton-width) flex-1"
+        data-sidebar="menu-skeleton-text"
+        style={
+          {
+            "--skeleton-width": width,
+          } as React.CSSProperties
+        }
+      />
+    </div>
+  )
+}
+
+function SidebarMenuSub({ className, ...props }: React.ComponentProps<"ul">) {
+  return (
+    <ul
+      data-slot="sidebar-menu-sub"
+      data-sidebar="menu-sub"
+      className={cn(
+        "border-sidebar-border mx-3.5 flex min-w-0 translate-x-px flex-col gap-1 border-l px-2.5 py-0.5",
+        "group-data-[collapsible=icon]:hidden",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SidebarMenuSubItem({
+  className,
+  ...props
+}: React.ComponentProps<"li">) {
+  return (
+    <li
+      data-slot="sidebar-menu-sub-item"
+      data-sidebar="menu-sub-item"
+      className={cn("group/menu-sub-item relative", className)}
+      {...props}
+    />
+  )
+}
+
+function SidebarMenuSubButton({
+  asChild = false,
+  size = "md",
+  isActive = false,
+  className,
+  ...props
+}: React.ComponentProps<"a"> & {
+  asChild?: boolean
+  size?: "sm" | "md"
+  isActive?: boolean
+}) {
+  const Comp = asChild ? Slot.Root : "a"
+
+  return (
+    <Comp
+      data-slot="sidebar-menu-sub-button"
+      data-sidebar="menu-sub-button"
+      data-size={size}
+      data-active={isActive}
+      className={cn(
+        "text-sidebar-foreground ring-sidebar-ring hover:bg-sidebar-accent hover:text-sidebar-accent-foreground active:bg-sidebar-accent active:text-sidebar-accent-foreground [&>svg]:text-sidebar-accent-foreground flex h-7 min-w-0 -translate-x-px items-center gap-2 overflow-hidden rounded-md px-2 outline-hidden focus-visible:ring-2 disabled:pointer-events-none disabled:opacity-50 aria-disabled:pointer-events-none aria-disabled:opacity-50 [&>span:last-child]:truncate [&>svg]:size-4 [&>svg]:shrink-0",
+        "data-[active=true]:bg-sidebar-accent data-[active=true]:text-sidebar-accent-foreground",
+        size === "sm" && "text-xs",
+        size === "md" && "text-sm",
+        "group-data-[collapsible=icon]:hidden",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export {
+  Sidebar,
+  SidebarContent,
+  SidebarFooter,
+  SidebarGroup,
+  SidebarGroupAction,
+  SidebarGroupContent,
+  SidebarGroupLabel,
+  SidebarHeader,
+  SidebarInput,
+  SidebarInset,
+  SidebarMenu,
+  SidebarMenuAction,
+  SidebarMenuBadge,
+  SidebarMenuButton,
+  SidebarMenuItem,
+  SidebarMenuSkeleton,
+  SidebarMenuSub,
+  SidebarMenuSubButton,
+  SidebarMenuSubItem,
+  SidebarProvider,
+  SidebarRail,
+  SidebarSeparator,
+  SidebarTrigger,
+  useSidebar,
+}
--- a/frontend/src/components/ui/skeleton.tsx
+++ b/frontend/src/components/ui/skeleton.tsx
@ -0,0 +1,13 @@
+import { cn } from "@/lib/utils"
+
+function Skeleton({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="skeleton"
+      className={cn("bg-accent animate-pulse rounded-md", className)}
+      {...props}
+    />
+  )
+}
+
+export { Skeleton }
--- a/frontend/src/components/ui/tooltip.tsx
+++ b/frontend/src/components/ui/tooltip.tsx
@ -0,0 +1,55 @@
+import * as React from "react"
+import { Tooltip as TooltipPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function TooltipProvider({
+  delayDuration = 0,
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Provider>) {
+  return (
+    <TooltipPrimitive.Provider
+      data-slot="tooltip-provider"
+      delayDuration={delayDuration}
+      {...props}
+    />
+  )
+}
+
+function Tooltip({
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Root>) {
+  return <TooltipPrimitive.Root data-slot="tooltip" {...props} />
+}
+
+function TooltipTrigger({
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Trigger>) {
+  return <TooltipPrimitive.Trigger data-slot="tooltip-trigger" {...props} />
+}
+
+function TooltipContent({
+  className,
+  sideOffset = 0,
+  children,
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Content>) {
+  return (
+    <TooltipPrimitive.Portal>
+      <TooltipPrimitive.Content
+        data-slot="tooltip-content"
+        sideOffset={sideOffset}
+        className={cn(
+          "bg-foreground text-background animate-in fade-in-0 zoom-in-95 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 z-50 w-fit origin-(--radix-tooltip-content-transform-origin) rounded-md px-3 py-1.5 text-xs text-balance",
+          className
+        )}
+        {...props}
+      >
+        {children}
+        <TooltipPrimitive.Arrow className="bg-foreground fill-foreground z-50 size-2.5 translate-y-[calc(-50%_-_2px)] rotate-45 rounded-[2px]" />
+      </TooltipPrimitive.Content>
+    </TooltipPrimitive.Portal>
+  )
+}
+
+export { Tooltip, TooltipTrigger, TooltipContent, TooltipProvider }
--- a/frontend/src/hooks/use-mobile.ts
+++ b/frontend/src/hooks/use-mobile.ts
@ -0,0 +1,19 @@
+import * as React from "react"
+
+const MOBILE_BREAKPOINT = 768
+
+export function useIsMobile() {
+  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(undefined)
+
+  React.useEffect(() => {
+    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`)
+    const onChange = () => {
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    }
+    mql.addEventListener("change", onChange)
+    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    return () => mql.removeEventListener("change", onChange)
+  }, [])
+
+  return !!isMobile
+}
--- a/frontend/src/layouts/default.layout.tsx
+++ b/frontend/src/layouts/default.layout.tsx
@ -0,0 +1,17 @@
+import ApplicationSidebar from "@/components/application/sidebar.component"
+import { SidebarProvider, SidebarTrigger } from "@/components/ui/sidebar"
+import { Outlet } from "@tanstack/react-router"
+
+function DefaultLayout() {
+  return (
+    <SidebarProvider>
+      <ApplicationSidebar />
+      <main className="flex min-h-screen flex-1 flex-col">
+        <SidebarTrigger />
+        <Outlet />
+      </main>
+    </SidebarProvider>
+  )
+}
+
+export default DefaultLayout
--- a/frontend/src/lib/utils.ts
+++ b/frontend/src/lib/utils.ts
@ -0,0 +1,6 @@
+import { clsx, type ClassValue } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@ -1,14 +1,19 @@
 import React from 'react'
 import {createRoot} from 'react-dom/client'
+import {RouterProvider} from '@tanstack/react-router'
+import {QueryClient, QueryClientProvider} from '@tanstack/react-query'
+import {router} from './router'
 import './style.css'
-import App from './App'
+
+const queryClient = new QueryClient()

 const container = document.getElementById('root')
-
 const root = createRoot(container!)

 root.render(
    <React.StrictMode>
-        <App/>
+        <QueryClientProvider client={queryClient}>
+            <RouterProvider router={router}/>
+        </QueryClientProvider>
    </React.StrictMode>
 )
--- a/frontend/src/pages/import.page.tsx
+++ b/frontend/src/pages/import.page.tsx
@ -0,0 +1,135 @@
+import {useEffect, useRef, useState} from 'react'
+import {GetImporters} from '../../wailsjs/go/main/App'
+import {imports} from '../../wailsjs/go/models'
+import {Button} from '@/components/ui/button'
+import {Card, CardContent, CardHeader, CardTitle} from '@/components/ui/card'
+import {Label} from '@/components/ui/label'
+import {
+    Select,
+    SelectContent,
+    SelectItem,
+    SelectTrigger,
+    SelectValue,
+} from '@/components/ui/select'
+
+function ImportPage() {
+    const [importers, setImporters] = useState<imports.ImporterInfo[]>([])
+    const [selectedImporter, setSelectedImporter] = useState('')
+    const [selectedVersion, setSelectedVersion] = useState('')
+    const [fileName, setFileName] = useState('')
+    const [error, setError] = useState('')
+    const [loading, setLoading] = useState(true)
+    const fileRef = useRef<HTMLInputElement>(null)
+
+    useEffect(() => {
+        GetImporters()
+            .then((list) => setImporters(list))
+            .catch((err: unknown) =>
+                setError(err instanceof Error ? err.message : String(err)),
+            )
+            .finally(() => setLoading(false))
+    }, [])
+
+    const currentImporter = importers.find((i) => i.name === selectedImporter)
+    const versions = currentImporter?.versions ?? []
+
+    function handleImporterChange(value: string) {
+        setSelectedImporter(value)
+        setSelectedVersion('')
+    }
+
+    function handleFileChange(e: React.ChangeEvent<HTMLInputElement>) {
+        const file = e.target.files?.[0]
+        setFileName(file ? file.name : '')
+    }
+
+    function handleImport() {
+        // TODO: wire up actual import logic
+    }
+
+    if (loading) {
+        return (
+            <div className="flex min-h-[50vh] items-center justify-center">
+                <p className="text-sm text-muted-foreground">Loading importers...</p>
+            </div>
+        )
+    }
+
+    return (
+        <div className="flex flex-1 items-center justify-center p-4">
+            <Card className="w-full max-w-md">
+                <CardHeader>
+                    <CardTitle className="text-2xl">Import Transactions</CardTitle>
+                </CardHeader>
+                <CardContent>
+                    <div className="flex flex-col gap-4">
+                        <div className="flex flex-col gap-2">
+                            <Label htmlFor="importer">Importer</Label>
+                            <Select value={selectedImporter} onValueChange={handleImporterChange}>
+                                <SelectTrigger id="importer" className="w-full">
+                                    <SelectValue placeholder="Select importer"/>
+                                </SelectTrigger>
+                                <SelectContent>
+                                    {importers.map((imp) => (
+                                        <SelectItem key={imp.name} value={imp.name}>
+                                            {imp.name}
+                                        </SelectItem>
+                                    ))}
+                                </SelectContent>
+                            </Select>
+                        </div>
+
+                        <div className="flex flex-col gap-2">
+                            <Label htmlFor="version">Version</Label>
+                            <Select
+                                value={selectedVersion}
+                                onValueChange={setSelectedVersion}
+                                disabled={!selectedImporter}
+                            >
+                                <SelectTrigger id="version" className="w-full">
+                                    <SelectValue placeholder="Select version"/>
+                                </SelectTrigger>
+                                <SelectContent>
+                                    {versions.map((v) => (
+                                        <SelectItem key={v} value={v}>
+                                            {v}
+                                        </SelectItem>
+                                    ))}
+                                </SelectContent>
+                            </Select>
+                        </div>
+
+                        <div className="flex flex-col gap-2">
+                            <Label htmlFor="csvFile">CSV File</Label>
+                            <input
+                                id="csvFile"
+                                ref={fileRef}
+                                type="file"
+                                accept=".csv"
+                                onChange={handleFileChange}
+                                className="text-sm file:mr-3 file:rounded-md file:border-0 file:bg-primary file:px-3 file:py-1.5 file:text-sm file:font-medium file:text-primary-foreground hover:file:bg-primary/90"
+                            />
+                            {fileName && (
+                                <p className="text-xs text-muted-foreground">{fileName}</p>
+                            )}
+                        </div>
+
+                        {error && (
+                            <p className="text-sm text-destructive">{error}</p>
+                        )}
+
+                        <Button
+                            className="w-full"
+                            disabled={!selectedImporter || !selectedVersion || !fileName}
+                            onClick={handleImport}
+                        >
+                            Import
+                        </Button>
+                    </div>
+                </CardContent>
+            </Card>
+        </div>
+    )
+}
+
+export default ImportPage
--- a/frontend/src/pages/setup.page.tsx
+++ b/frontend/src/pages/setup.page.tsx
@ -0,0 +1,78 @@
+import {useState} from 'react'
+import {useNavigate} from '@tanstack/react-router'
+import {ConnectDatabase, InitEncryption} from '../../wailsjs/go/main/App'
+import {Button} from '@/components/ui/button'
+import {Input} from '@/components/ui/input'
+import {Card, CardContent, CardDescription, CardHeader, CardTitle} from '@/components/ui/card'
+
+function SetupPage() {
+    const navigate = useNavigate()
+    const [dbPath, setDbPath] = useState('')
+    const [passphrase, setPassphrase] = useState('')
+    const [error, setError] = useState('')
+    const [loading, setLoading] = useState(false)
+
+    async function handleSubmit(e: React.FormEvent) {
+        e.preventDefault()
+        setError('')
+        setLoading(true)
+
+        try {
+            await ConnectDatabase(dbPath)
+            await InitEncryption(passphrase)
+            navigate({to: '/'})
+        } catch (err: unknown) {
+            setError(err instanceof Error ? err.message : String(err))
+        } finally {
+            setLoading(false)
+        }
+    }
+
+    return (
+        <div className="flex min-h-screen items-center justify-center p-4">
+            <Card className="w-full max-w-md">
+                <CardHeader>
+                    <CardTitle className="text-2xl">Finance Tracking</CardTitle>
+                </CardHeader>
+                <CardContent>
+                    <form onSubmit={handleSubmit} className="flex flex-col gap-4">
+                        <div className="flex flex-col gap-2">
+                            <label htmlFor="dbPath" className="text-sm font-medium">
+                                Database Path
+                            </label>
+                            <Input
+                                id="dbPath"
+                                type="text"
+                                placeholder="/path/to/database.db"
+                                value={dbPath}
+                                onChange={(e) => setDbPath(e.target.value)}
+                                required
+                            />
+                        </div>
+                        <div className="flex flex-col gap-2">
+                            <label htmlFor="passphrase" className="text-sm font-medium">
+                                Passphrase
+                            </label>
+                            <Input
+                                id="passphrase"
+                                type="password"
+                                placeholder="Enter your encryption passphrase"
+                                value={passphrase}
+                                onChange={(e) => setPassphrase(e.target.value)}
+                                required
+                            />
+                        </div>
+                        {error && (
+                            <p className="text-sm text-destructive">{error}</p>
+                        )}
+                        <Button type="submit" disabled={loading} className="w-full">
+                            {loading ? 'Connecting...' : 'Unlock'}
+                        </Button>
+                    </form>
+                </CardContent>
+            </Card>
+        </div>
+    )
+}
+
+export default SetupPage
--- a/frontend/src/router.tsx
+++ b/frontend/src/router.tsx
@ -0,0 +1,89 @@
+import {
+    createRouter,
+    createRootRoute,
+    createRoute,
+    createHashHistory,
+    Outlet,
+    redirect,
+} from '@tanstack/react-router'
+import {Card, CardContent, CardDescription, CardHeader, CardTitle} from '@/components/ui/card'
+import {GetStatus} from '../wailsjs/go/main/App'
+import DefaultLayout from './layouts/default.layout'
+import ImportPage from './pages/import.page'
+import SetupPage from './pages/setup.page'
+
+const rootRoute = createRootRoute({
+    component: () => <Outlet/>,
+})
+
+// Setup route — standalone (no sidebar), redirects away if already ready
+const setupRoute = createRoute({
+    getParentRoute: () => rootRoute,
+    path: '/setup',
+    component: SetupPage,
+    beforeLoad: async () => {
+        const status = await GetStatus()
+        if (status === 'ready') {
+            throw redirect({to: '/'})
+        }
+    },
+})
+
+// App layout route — wraps all authenticated routes, redirects to /setup if not ready
+const appLayoutRoute = createRoute({
+    getParentRoute: () => rootRoute,
+    id: 'app',
+    component: DefaultLayout,
+    beforeLoad: async () => {
+        const status = await GetStatus()
+        if (status !== 'ready') {
+            throw redirect({to: '/setup'})
+        }
+    },
+})
+
+const indexRoute = createRoute({
+    getParentRoute: () => appLayoutRoute,
+    path: '/',
+    component: ImportPage,
+})
+
+const aboutRoute = createRoute({
+    getParentRoute: () => appLayoutRoute,
+    path: '/about',
+    component: () => (
+        <div className="flex flex-col items-center gap-6">
+            <h1 className="text-3xl font-bold">About</h1>
+            <Card className="w-full max-w-md">
+                <CardHeader>
+                    <CardTitle>Tech Stack</CardTitle>
+                    <CardDescription>Everything powering this app.</CardDescription>
+                </CardHeader>
+                <CardContent>
+                    <ul className="list-disc list-inside text-sm text-muted-foreground space-y-1">
+                        <li>Wails v2 (Go backend)</li>
+                        <li>React 18 + TypeScript</li>
+                        <li>TailwindCSS v4</li>
+                        <li>TanStack Router & Query</li>
+                        <li>shadcn/ui components</li>
+                    </ul>
+                </CardContent>
+            </Card>
+        </div>
+    ),
+})
+
+const routeTree = rootRoute.addChildren([
+    setupRoute,
+    appLayoutRoute.addChildren([indexRoute, aboutRoute]),
+])
+
+const hashHistory = createHashHistory()
+
+export const router = createRouter({routeTree, history: hashHistory})
+
+declare module '@tanstack/react-router' {
+    interface Register {
+        router: typeof router
+    }
+}
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@ -1,16 +1,8 @@
-html {
-    background-color: rgba(27, 38, 54, 1);
-    text-align: center;
-    color: white;
-}
+@import "tailwindcss";
+@import "tw-animate-css";
+@import "shadcn/tailwind.css";

-body {
-    margin: 0;
-    color: white;
-    font-family: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
-    "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
-    sans-serif;
-}
+@custom-variant dark (&:is(.dark *));

@font-face {
    font-family: "Nunito";
@ -20,7 +12,128 @@ body {
    url("assets/fonts/nunito-v16-latin-regular.woff2") format("woff2");
 }

-#app {
-    height: 100vh;
-    text-align: center;
+@theme {
+    --font-sans: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
+        "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
+        sans-serif;
+    --color-wails-bg: rgba(27, 38, 54, 1);
 }
+
+@theme inline {
+    --radius-sm: calc(var(--radius) - 4px);
+    --radius-md: calc(var(--radius) - 2px);
+    --radius-lg: var(--radius);
+    --radius-xl: calc(var(--radius) + 4px);
+    --radius-2xl: calc(var(--radius) + 8px);
+    --radius-3xl: calc(var(--radius) + 12px);
+    --radius-4xl: calc(var(--radius) + 16px);
+    --color-background: var(--background);
+    --color-foreground: var(--foreground);
+    --color-card: var(--card);
+    --color-card-foreground: var(--card-foreground);
+    --color-popover: var(--popover);
+    --color-popover-foreground: var(--popover-foreground);
+    --color-primary: var(--primary);
+    --color-primary-foreground: var(--primary-foreground);
+    --color-secondary: var(--secondary);
+    --color-secondary-foreground: var(--secondary-foreground);
+    --color-muted: var(--muted);
+    --color-muted-foreground: var(--muted-foreground);
+    --color-accent: var(--accent);
+    --color-accent-foreground: var(--accent-foreground);
+    --color-destructive: var(--destructive);
+    --color-border: var(--border);
+    --color-input: var(--input);
+    --color-ring: var(--ring);
+    --color-chart-1: var(--chart-1);
+    --color-chart-2: var(--chart-2);
+    --color-chart-3: var(--chart-3);
+    --color-chart-4: var(--chart-4);
+    --color-chart-5: var(--chart-5);
+    --color-sidebar: var(--sidebar);
+    --color-sidebar-foreground: var(--sidebar-foreground);
+    --color-sidebar-primary: var(--sidebar-primary);
+    --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
+    --color-sidebar-accent: var(--sidebar-accent);
+    --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
+    --color-sidebar-border: var(--sidebar-border);
+    --color-sidebar-ring: var(--sidebar-ring);
+}
+
+:root {
+    --radius: 0.625rem;
+    --background: oklch(1 0 0);
+    --foreground: oklch(0.145 0 0);
+    --card: oklch(1 0 0);
+    --card-foreground: oklch(0.145 0 0);
+    --popover: oklch(1 0 0);
+    --popover-foreground: oklch(0.145 0 0);
+    --primary: oklch(0.205 0 0);
+    --primary-foreground: oklch(0.985 0 0);
+    --secondary: oklch(0.97 0 0);
+    --secondary-foreground: oklch(0.205 0 0);
+    --muted: oklch(0.97 0 0);
+    --muted-foreground: oklch(0.556 0 0);
+    --accent: oklch(0.97 0 0);
+    --accent-foreground: oklch(0.205 0 0);
+    --destructive: oklch(0.577 0.245 27.325);
+    --border: oklch(0.922 0 0);
+    --input: oklch(0.922 0 0);
+    --ring: oklch(0.708 0 0);
+    --chart-1: oklch(0.646 0.222 41.116);
+    --chart-2: oklch(0.6 0.118 184.704);
+    --chart-3: oklch(0.398 0.07 227.392);
+    --chart-4: oklch(0.828 0.189 84.429);
+    --chart-5: oklch(0.769 0.188 70.08);
+    --sidebar: oklch(0.985 0 0);
+    --sidebar-foreground: oklch(0.145 0 0);
+    --sidebar-primary: oklch(0.205 0 0);
+    --sidebar-primary-foreground: oklch(0.985 0 0);
+    --sidebar-accent: oklch(0.97 0 0);
+    --sidebar-accent-foreground: oklch(0.205 0 0);
+    --sidebar-border: oklch(0.922 0 0);
+    --sidebar-ring: oklch(0.708 0 0);
+}
+
+.dark {
+    --background: oklch(0.145 0 0);
+    --foreground: oklch(0.985 0 0);
+    --card: oklch(0.205 0 0);
+    --card-foreground: oklch(0.985 0 0);
+    --popover: oklch(0.205 0 0);
+    --popover-foreground: oklch(0.985 0 0);
+    --primary: oklch(0.922 0 0);
+    --primary-foreground: oklch(0.205 0 0);
+    --secondary: oklch(0.269 0 0);
+    --secondary-foreground: oklch(0.985 0 0);
+    --muted: oklch(0.269 0 0);
+    --muted-foreground: oklch(0.708 0 0);
+    --accent: oklch(0.269 0 0);
+    --accent-foreground: oklch(0.985 0 0);
+    --destructive: oklch(0.704 0.191 22.216);
+    --border: oklch(1 0 0 / 10%);
+    --input: oklch(1 0 0 / 15%);
+    --ring: oklch(0.556 0 0);
+    --chart-1: oklch(0.488 0.243 264.376);
+    --chart-2: oklch(0.696 0.17 162.48);
+    --chart-3: oklch(0.769 0.188 70.08);
+    --chart-4: oklch(0.627 0.265 303.9);
+    --chart-5: oklch(0.645 0.246 16.439);
+    --sidebar: oklch(0.205 0 0);
+    --sidebar-foreground: oklch(0.985 0 0);
+    --sidebar-primary: oklch(0.488 0.243 264.376);
+    --sidebar-primary-foreground: oklch(0.985 0 0);
+    --sidebar-accent: oklch(0.269 0 0);
+    --sidebar-accent-foreground: oklch(0.985 0 0);
+    --sidebar-border: oklch(1 0 0 / 10%);
+    --sidebar-ring: oklch(0.556 0 0);
+}
+
+@layer base {
+  * {
+    @apply border-border outline-ring/50;
+    }
+  body {
+    @apply bg-background text-foreground;
+    }
+}
--- a/frontend/tsconfig.json
+++ b/frontend/tsconfig.json
@ -14,11 +14,15 @@
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "module": "ESNext",
-    "moduleResolution": "Node",
+    "moduleResolution": "bundler",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
-    "jsx": "react-jsx"
+    "jsx": "react-jsx",
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["./src/*"]
+    }
  },
  "include": [
    "src"
--- a/frontend/tsconfig.node.json
+++ b/frontend/tsconfig.node.json
@ -2,7 +2,7 @@
  "compilerOptions": {
    "composite": true,
    "module": "ESNext",
-    "moduleResolution": "Node",
+    "moduleResolution": "bundler",
    "allowSyntheticDefaultImports": true
  },
  "include": [
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@ -1,7 +1,16 @@
+import path from 'path'
 import {defineConfig} from 'vite'
 import react from '@vitejs/plugin-react'
+import tailwindcss from '@tailwindcss/vite'

-// https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [react()]
+  plugins: [
+    react(),
+    tailwindcss(),
+  ],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
 })
--- a/frontend/wailsjs/go/main/App.d.ts
+++ b/frontend/wailsjs/go/main/App.d.ts
@ -1,4 +1,26 @@
 // Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
 // This file is automatically generated. DO NOT EDIT
+import {models} from '../models';
+import {imports} from '../models';

-export function Greet(arg1: string): Promise<string>;
+export function ConnectDatabase(arg1:string):Promise<void>;
+
+export function CreateCustomer(arg1:string,arg2:string,arg3:string,arg4:string):Promise<number>;
+
+export function DeleteCustomer(arg1:number):Promise<void>;
+
+export function EnsureSchema():Promise<void>;
+
+export function GetCustomer(arg1:number):Promise<models.Customer>;
+
+export function GetCustomers():Promise<Array<models.CustomerListItem>>;
+
+export function GetImporters():Promise<Array<imports.ImporterInfo>>;
+
+export function GetStatus():Promise<string>;
+
+export function Greet(arg1:string):Promise<string>;
+
+export function InitEncryption(arg1:string):Promise<void>;
+
+export function UpdateCustomer(arg1:number,arg2:string,arg3:string,arg4:string,arg5:string):Promise<void>;
--- a/frontend/wailsjs/go/main/App.js
+++ b/frontend/wailsjs/go/main/App.js
@ -2,6 +2,46 @@
 // Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
 // This file is automatically generated. DO NOT EDIT

-export function Greet(arg1) {
-    return window['go']['main']['App']['Greet'](arg1);
+export function ConnectDatabase(arg1) {
+  return window['go']['main']['App']['ConnectDatabase'](arg1);
+}
+
+export function CreateCustomer(arg1, arg2, arg3, arg4) {
+  return window['go']['main']['App']['CreateCustomer'](arg1, arg2, arg3, arg4);
+}
+
+export function DeleteCustomer(arg1) {
+  return window['go']['main']['App']['DeleteCustomer'](arg1);
+}
+
+export function EnsureSchema() {
+  return window['go']['main']['App']['EnsureSchema']();
+}
+
+export function GetCustomer(arg1) {
+  return window['go']['main']['App']['GetCustomer'](arg1);
+}
+
+export function GetCustomers() {
+  return window['go']['main']['App']['GetCustomers']();
+}
+
+export function GetImporters() {
+  return window['go']['main']['App']['GetImporters']();
+}
+
+export function GetStatus() {
+  return window['go']['main']['App']['GetStatus']();
+}
+
+export function Greet(arg1) {
+  return window['go']['main']['App']['Greet'](arg1);
+}
+
+export function InitEncryption(arg1) {
+  return window['go']['main']['App']['InitEncryption'](arg1);
+}
+
+export function UpdateCustomer(arg1, arg2, arg3, arg4, arg5) {
+  return window['go']['main']['App']['UpdateCustomer'](arg1, arg2, arg3, arg4, arg5);
 }
--- a/frontend/wailsjs/go/models.ts
+++ b/frontend/wailsjs/go/models.ts
@ -0,0 +1,86 @@
+export namespace imports {
+	
+	export class ImporterInfo {
+	    name: string;
+	    versions: string[];
+	
+	    static createFrom(source: any = {}) {
+	        return new ImporterInfo(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.name = source["name"];
+	        this.versions = source["versions"];
+	    }
+	}
+
+}
+
+export namespace models {
+	
+	export class Customer {
+	    id: number;
+	    name: string;
+	    email: string;
+	    phone: string;
+	    company: string;
+	    // Go type: time
+	    createdAt: any;
+	    // Go type: time
+	    updatedAt: any;
+	
+	    static createFrom(source: any = {}) {
+	        return new Customer(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.id = source["id"];
+	        this.name = source["name"];
+	        this.email = source["email"];
+	        this.phone = source["phone"];
+	        this.company = source["company"];
+	        this.createdAt = this.convertValues(source["createdAt"], null);
+	        this.updatedAt = this.convertValues(source["updatedAt"], null);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
+	export class CustomerListItem {
+	    id: number;
+	    name: string;
+	    email: string;
+	    company: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new CustomerListItem(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.id = source["id"];
+	        this.name = source["name"];
+	        this.email = source["email"];
+	        this.company = source["company"];
+	    }
+	}
+
+}
+
--- a/frontend/wailsjs/runtime/runtime.d.ts
+++ b/frontend/wailsjs/runtime/runtime.d.ts
@ -21,8 +21,8 @@ export interface Size {
 export interface Screen {
    isCurrent: boolean;
    isPrimary: boolean;
-    width: number
-    height: number
+    width : number
+    height : number
 }

 // Environment information such as platform, buildtype, ...
@ -38,19 +38,23 @@ export interface EnvironmentInfo {
 export function EventsEmit(eventName: string, ...data: any): void;

 // [EventsOn](https://wails.io/docs/reference/runtime/events#eventson) sets up a listener for the given event name.
-export function EventsOn(eventName: string, callback: (...data: any) => void): void;
+export function EventsOn(eventName: string, callback: (...data: any) => void): () => void;

 // [EventsOnMultiple](https://wails.io/docs/reference/runtime/events#eventsonmultiple)
 // sets up a listener for the given event name, but will only trigger a given number times.
-export function EventsOnMultiple(eventName: string, callback: (...data: any) => void, maxCallbacks: number): void;
+export function EventsOnMultiple(eventName: string, callback: (...data: any) => void, maxCallbacks: number): () => void;

 // [EventsOnce](https://wails.io/docs/reference/runtime/events#eventsonce)
 // sets up a listener for the given event name, but will only trigger once.
-export function EventsOnce(eventName: string, callback: (...data: any) => void): void;
+export function EventsOnce(eventName: string, callback: (...data: any) => void): () => void;

-// [EventsOff](https://wails.io/docs/reference/runtime/events#eventsff)
+// [EventsOff](https://wails.io/docs/reference/runtime/events#eventsoff)
 // unregisters the listener for the given event name.
-export function EventsOff(eventName: string): void;
+export function EventsOff(eventName: string, ...additionalEventNames: string[]): void;
+
+// [EventsOffAll](https://wails.io/docs/reference/runtime/events#eventsoffall)
+// unregisters all listeners.
+export function EventsOffAll(): void;

 // [LogPrint](https://wails.io/docs/reference/runtime/log#logprint)
 // logs the given message as a raw message
@ -124,6 +128,10 @@ export function WindowFullscreen(): void;
 // Restores the previous window dimensions and position prior to full screen.
 export function WindowUnfullscreen(): void;

+// [WindowIsFullscreen](https://wails.io/docs/reference/runtime/window#windowisfullscreen)
+// Returns the state of the window, i.e. whether the window is in full screen mode or not.
+export function WindowIsFullscreen(): Promise<boolean>;
+
 // [WindowSetSize](https://wails.io/docs/reference/runtime/window#windowsetsize)
 // Sets the width and height of the window.
 export function WindowSetSize(width: number, height: number): void;
@ -170,6 +178,10 @@ export function WindowToggleMaximise(): void;
 // Restores the window to the dimensions and position prior to maximising.
 export function WindowUnmaximise(): void;

+// [WindowIsMaximised](https://wails.io/docs/reference/runtime/window#windowismaximised)
+// Returns the state of the window, i.e. whether the window is maximised or not.
+export function WindowIsMaximised(): Promise<boolean>;
+
 // [WindowMinimise](https://wails.io/docs/reference/runtime/window#windowminimise)
 // Minimises the window.
 export function WindowMinimise(): void;
@ -178,6 +190,14 @@ export function WindowMinimise(): void;
 // Restores the window to the dimensions and position prior to minimising.
 export function WindowUnminimise(): void;

+// [WindowIsMinimised](https://wails.io/docs/reference/runtime/window#windowisminimised)
+// Returns the state of the window, i.e. whether the window is minimised or not.
+export function WindowIsMinimised(): Promise<boolean>;
+
+// [WindowIsNormal](https://wails.io/docs/reference/runtime/window#windowisnormal)
+// Returns the state of the window, i.e. whether the window is normal or not.
+export function WindowIsNormal(): Promise<boolean>;
+
 // [WindowSetBackgroundColour](https://wails.io/docs/reference/runtime/window#windowsetbackgroundcolour)
 // Sets the background colour of the window to the given RGBA colour definition. This colour will show through for all transparent pixels.
 export function WindowSetBackgroundColour(R: number, G: number, B: number, A: number): void;
@ -205,3 +225,25 @@ export function Hide(): void;
 // [Show](https://wails.io/docs/reference/runtime/intro#show)
 // Shows the application.
 export function Show(): void;
+
+// [ClipboardGetText](https://wails.io/docs/reference/runtime/clipboard#clipboardgettext)
+// Returns the current text stored on clipboard
+export function ClipboardGetText(): Promise<string>;
+
+// [ClipboardSetText](https://wails.io/docs/reference/runtime/clipboard#clipboardsettext)
+// Sets a text on the clipboard
+export function ClipboardSetText(text: string): Promise<boolean>;
+
+// [OnFileDrop](https://wails.io/docs/reference/runtime/draganddrop#onfiledrop)
+// OnFileDrop listens to drag and drop events and calls the callback with the coordinates of the drop and an array of path strings.
+export function OnFileDrop(callback: (x: number, y: number ,paths: string[]) => void, useDropTarget: boolean) :void
+
+// [OnFileDropOff](https://wails.io/docs/reference/runtime/draganddrop#dragandddropoff)
+// OnFileDropOff removes the drag and drop listeners and handlers.
+export function OnFileDropOff() :void
+
+// Check if the file path resolver is available
+export function CanResolveFilePaths(): boolean;
+
+// Resolves file paths for an array of files
+export function ResolveFilePaths(files: File[]): void
--- a/frontend/wailsjs/runtime/runtime.js
+++ b/frontend/wailsjs/runtime/runtime.js
@ -37,19 +37,23 @@ export function LogFatal(message) {
 }

 export function EventsOnMultiple(eventName, callback, maxCallbacks) {
-    window.runtime.EventsOnMultiple(eventName, callback, maxCallbacks);
+    return window.runtime.EventsOnMultiple(eventName, callback, maxCallbacks);
 }

 export function EventsOn(eventName, callback) {
-    EventsOnMultiple(eventName, callback, -1);
+    return EventsOnMultiple(eventName, callback, -1);
 }

-export function EventsOff(eventName) {
-    return window.runtime.EventsOff(eventName);
+export function EventsOff(eventName, ...additionalEventNames) {
+    return window.runtime.EventsOff(eventName, ...additionalEventNames);
+}
+
+export function EventsOffAll() {
+  return window.runtime.EventsOffAll();
 }

 export function EventsOnce(eventName, callback) {
-    EventsOnMultiple(eventName, callback, 1);
+    return EventsOnMultiple(eventName, callback, 1);
 }

 export function EventsEmit(eventName) {
@ -97,6 +101,10 @@ export function WindowUnfullscreen() {
    window.runtime.WindowUnfullscreen();
 }

+export function WindowIsFullscreen() {
+    return window.runtime.WindowIsFullscreen();
+}
+
 export function WindowGetSize() {
    return window.runtime.WindowGetSize();
 }
@ -141,6 +149,10 @@ export function WindowUnmaximise() {
    window.runtime.WindowUnmaximise();
 }

+export function WindowIsMaximised() {
+    return window.runtime.WindowIsMaximised();
+}
+
 export function WindowMinimise() {
    window.runtime.WindowMinimise();
 }
@ -157,6 +169,14 @@ export function ScreenGetAll() {
    return window.runtime.ScreenGetAll();
 }

+export function WindowIsMinimised() {
+    return window.runtime.WindowIsMinimised();
+}
+
+export function WindowIsNormal() {
+    return window.runtime.WindowIsNormal();
+}
+
 export function BrowserOpenURL(url) {
    window.runtime.BrowserOpenURL(url);
 }
@ -176,3 +196,47 @@ export function Hide() {
 export function Show() {
    window.runtime.Show();
 }
+
+export function ClipboardGetText() {
+    return window.runtime.ClipboardGetText();
+}
+
+export function ClipboardSetText(text) {
+    return window.runtime.ClipboardSetText(text);
+}
+
+/**
+ * Callback for OnFileDrop returns a slice of file path strings when a drop is finished.
+ *
+ * @export
+ * @callback OnFileDropCallback
+ * @param {number} x - x coordinate of the drop
+ * @param {number} y - y coordinate of the drop
+ * @param {string[]} paths - A list of file paths.
+ */
+
+/**
+ * OnFileDrop listens to drag and drop events and calls the callback with the coordinates of the drop and an array of path strings.
+ *
+ * @export
+ * @param {OnFileDropCallback} callback - Callback for OnFileDrop returns a slice of file path strings when a drop is finished.
+ * @param {boolean} [useDropTarget=true] - Only call the callback when the drop finished on an element that has the drop target style. (--wails-drop-target)
+ */
+export function OnFileDrop(callback, useDropTarget) {
+    return window.runtime.OnFileDrop(callback, useDropTarget);
+}
+
+/**
+ * OnFileDropOff removes the drag and drop listeners and handlers.
+ */
+export function OnFileDropOff() {
+    return window.runtime.OnFileDropOff();
+}
+
+export function CanResolveFilePaths() {
+    return window.runtime.CanResolveFilePaths();
+}
+
+export function ResolveFilePaths(files) {
+    return window.runtime.ResolveFilePaths(files);
+}
--- a/go.mod
+++ b/go.mod
@ -1,11 +1,16 @@
 module fncConvertGui

-go 1.23
+go 1.24.0

-require github.com/wailsapp/wails/v2 v2.11.0
+require (
+	github.com/wailsapp/wails/v2 v2.11.0
+	golang.org/x/crypto v0.33.0
+	modernc.org/sqlite v1.46.1
+)

 require (
 	github.com/bep/debounce v1.2.1 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/go-ole/go-ole v1.3.0 // indirect
 	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
@ -19,8 +24,10 @@ require (
 	github.com/leaanthony/u v1.1.1 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/samber/lo v1.49.1 // indirect
 	github.com/tkrajina/go-reflector v0.5.8 // indirect
@ -28,10 +35,13 @@ require (
 	github.com/valyala/fasttemplate v1.2.2 // indirect
 	github.com/wailsapp/go-webview2 v1.0.22 // indirect
 	github.com/wailsapp/mimetype v1.4.1 // indirect
-	golang.org/x/crypto v0.33.0 // indirect
+	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
 	golang.org/x/net v0.35.0 // indirect
-	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/sys v0.37.0 // indirect
 	golang.org/x/text v0.22.0 // indirect
+	modernc.org/libc v1.67.6 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
 )

 // replace github.com/wailsapp/wails/v2 v2.11.0 => C:\Users\kuaku\go\pkg\mod
--- a/go.sum
+++ b/go.sum
@ -2,14 +2,20 @@ github.com/bep/debounce v1.2.1 h1:v67fRdBA9UQu2NhLFXrSg0Brw7CexQekrBwDMM8bzeY=
 github.com/bep/debounce v1.2.1/go.mod h1:H8yggRPQKLUhUoqrJC1bO2xNya7vanpDl7xR3ISbCJ0=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/go-ole/go-ole v1.3.0 h1:Dt6ye7+vXGIKZ7Xtk4s6/xVdGDQynvom7xCFEdWr6uE=
 github.com/go-ole/go-ole v1.3.0/go.mod h1:5LS6F96DhAwUc7C+1HLexzMXY1xGRSryjyPPKW6zv78=
 github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
 github.com/godbus/dbus/v5 v5.1.0/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e h1:Q3+PugElBCf4PFpxhErSzU3/PY5sFL5Z6rfv4AbGAck=
 github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e/go.mod h1:alcuEEnZsY1WQsagKhZDsoPCRoOijYqhZvPwLG0kzVs=
 github.com/labstack/echo/v4 v4.13.3 h1:pwhpCPrTl5qry5HRdM5FwdXnhXSLSY+WE+YQSeCaafY=
@ -34,12 +40,16 @@ github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovk
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
+github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmdv1U2eRNDiU2ErMBj1gwrq8eQ=
 github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
@ -61,21 +71,57 @@ github.com/wailsapp/wails/v2 v2.11.0 h1:seLacV8pqupq32IjS4Y7V8ucab0WZwtK6VvUVxSB
 github.com/wailsapp/wails/v2 v2.11.0/go.mod h1:jrf0ZaM6+GBc1wRmXsM8cIvzlg0karYin3erahI4+0k=
 golang.org/x/crypto v0.33.0 h1:IOBPskki6Lysi0lo9qQvbxiQ+FvsCC/YWOecCHAixus=
 golang.org/x/crypto v0.33.0/go.mod h1:bVdXmD7IV/4GdElGPozy6U7lWdRXA4qyRVGJV57uQ5M=
+golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 h1:mgKeJMpvi0yx/sU5GsxQ7p6s2wtOnGAHZWCHUM4KGzY=
+golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546/go.mod h1:j/pmGrbnkbPtQfxEe5D0VQhZC6qKbfKifgD0oM7sR70=
+golang.org/x/mod v0.29.0 h1:HV8lRxZC4l2cr3Zq1LvtOsi/ThTgWnUk/y64QSs8GwA=
+golang.org/x/mod v0.29.0/go.mod h1:NyhrlYXJ2H4eJiRy/WDBO6HMqZQ6q9nk4JzS3NuCK+w=
 golang.org/x/net v0.0.0-20210505024714-0287a6fb4125/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
 golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
+golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
+golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
 golang.org/x/sys v0.0.0-20200810151505-1b9f1253b3ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
-golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
+golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
 golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
+golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+modernc.org/cc/v4 v4.27.1 h1:9W30zRlYrefrDV2JE2O8VDtJ1yPGownxciz5rrbQZis=
+modernc.org/cc/v4 v4.27.1/go.mod h1:uVtb5OGqUKpoLWhqwNQo/8LwvoiEBLvZXIQ/SmO6mL0=
+modernc.org/ccgo/v4 v4.30.1 h1:4r4U1J6Fhj98NKfSjnPUN7Ze2c6MnAdL0hWw6+LrJpc=
+modernc.org/ccgo/v4 v4.30.1/go.mod h1:bIOeI1JL54Utlxn+LwrFyjCx2n2RDiYEaJVSrgdrRfM=
+modernc.org/fileutil v1.3.40 h1:ZGMswMNc9JOCrcrakF1HrvmergNLAmxOPjizirpfqBA=
+modernc.org/fileutil v1.3.40/go.mod h1:HxmghZSZVAz/LXcMNwZPA/DRrQZEVP9VX0V4LQGQFOc=
+modernc.org/gc/v2 v2.6.5 h1:nyqdV8q46KvTpZlsw66kWqwXRHdjIlJOhG6kxiV/9xI=
+modernc.org/gc/v2 v2.6.5/go.mod h1:YgIahr1ypgfe7chRuJi2gD7DBQiKSLMPgBQe9oIiito=
+modernc.org/gc/v3 v3.1.1 h1:k8T3gkXWY9sEiytKhcgyiZ2L0DTyCQ/nvX+LoCljoRE=
+modernc.org/gc/v3 v3.1.1/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
+modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
+modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
+modernc.org/libc v1.67.6 h1:eVOQvpModVLKOdT+LvBPjdQqfrZq+pC39BygcT+E7OI=
+modernc.org/libc v1.67.6/go.mod h1:JAhxUVlolfYDErnwiqaLvUqc8nfb2r6S6slAgZOnaiE=
+modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
+modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
+modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
+modernc.org/memory v1.11.0/go.mod h1:/JP4VbVC+K5sU2wZi9bHoq2MAkCnrt2r98UGeSK7Mjw=
+modernc.org/opt v0.1.4 h1:2kNGMRiUjrp4LcaPuLY2PzUfqM/w9N23quVwhKt5Qm8=
+modernc.org/opt v0.1.4/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
+modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
+modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
+modernc.org/sqlite v1.46.1 h1:eFJ2ShBLIEnUWlLy12raN0Z1plqmFX9Qe3rjQTKt6sU=
+modernc.org/sqlite v1.46.1/go.mod h1:CzbrU2lSB1DKUusvwGz7rqEKIq+NUd8GWuBBZDs9/nA=
+modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
+modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
+modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
+modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
--- a/internal/crypto/crypto.go
+++ b/internal/crypto/crypto.go
@ -0,0 +1,107 @@
+package crypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+
+	"golang.org/x/crypto/argon2"
+)
+
+// Params holds Argon2id parameters and the salt used for key derivation.
+type Params struct {
+	Salt    []byte
+	Time    uint32
+	Memory  uint32
+	Threads uint8
+}
+
+// DefaultParams generates new Params with a random 16-byte salt and
+// reasonable Argon2id defaults.
+func DefaultParams() (*Params, error) {
+	salt := make([]byte, 16)
+	if _, err := io.ReadFull(rand.Reader, salt); err != nil {
+		return nil, fmt.Errorf("generate salt: %w", err)
+	}
+	return &Params{
+		Salt:    salt,
+		Time:    3,
+		Memory:  64 * 1024,
+		Threads: 4,
+	}, nil
+}
+
+// DeriveKey derives a 32-byte AES-256 key from a passphrase using Argon2id.
+func DeriveKey(passphrase string, p *Params) []byte {
+	return argon2.IDKey([]byte(passphrase), p.Salt, p.Time, p.Memory, p.Threads, 32)
+}
+
+// Encryptor provides AES-256-GCM encryption and decryption.
+type Encryptor struct {
+	aead cipher.AEAD
+}
+
+// NewEncryptor creates an Encryptor from a 32-byte key.
+func NewEncryptor(key []byte) (*Encryptor, error) {
+	if len(key) != 32 {
+		return nil, errors.New("key must be 32 bytes")
+	}
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, fmt.Errorf("new cipher: %w", err)
+	}
+	aead, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, fmt.Errorf("new gcm: %w", err)
+	}
+	return &Encryptor{aead: aead}, nil
+}
+
+// Encrypt encrypts plaintext. The returned ciphertext has the nonce prepended.
+func (e *Encryptor) Encrypt(plaintext []byte) ([]byte, error) {
+	nonce := make([]byte, e.aead.NonceSize())
+	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
+		return nil, fmt.Errorf("generate nonce: %w", err)
+	}
+	return e.aead.Seal(nonce, nonce, plaintext, nil), nil
+}
+
+// Decrypt decrypts ciphertext produced by Encrypt.
+func (e *Encryptor) Decrypt(ciphertext []byte) ([]byte, error) {
+	nonceSize := e.aead.NonceSize()
+	if len(ciphertext) < nonceSize {
+		return nil, errors.New("ciphertext too short")
+	}
+	nonce, ct := ciphertext[:nonceSize], ciphertext[nonceSize:]
+	plaintext, err := e.aead.Open(nil, nonce, ct, nil)
+	if err != nil {
+		return nil, fmt.Errorf("decrypt: %w", err)
+	}
+	return plaintext, nil
+}
+
+// EncryptString encrypts a string and returns base64-encoded ciphertext.
+func (e *Encryptor) EncryptString(plaintext string) (string, error) {
+	ct, err := e.Encrypt([]byte(plaintext))
+	if err != nil {
+		return "", err
+	}
+	return base64.StdEncoding.EncodeToString(ct), nil
+}
+
+// DecryptString decodes base64 ciphertext and returns the decrypted string.
+func (e *Encryptor) DecryptString(encoded string) (string, error) {
+	ct, err := base64.StdEncoding.DecodeString(encoded)
+	if err != nil {
+		return "", fmt.Errorf("decode base64: %w", err)
+	}
+	pt, err := e.Decrypt(ct)
+	if err != nil {
+		return "", err
+	}
+	return string(pt), nil
+}
--- a/internal/crypto/crypto_test.go
+++ b/internal/crypto/crypto_test.go
@ -0,0 +1,125 @@
+package crypto
+
+import (
+	"testing"
+)
+
+func TestDefaultParams(t *testing.T) {
+	p, err := DefaultParams()
+	if err != nil {
+		t.Fatalf("DefaultParams: %v", err)
+	}
+	if len(p.Salt) != 16 {
+		t.Fatalf("expected 16-byte salt, got %d", len(p.Salt))
+	}
+}
+
+func TestDeriveKey(t *testing.T) {
+	p, _ := DefaultParams()
+	key := DeriveKey("test-passphrase", p)
+	if len(key) != 32 {
+		t.Fatalf("expected 32-byte key, got %d", len(key))
+	}
+
+	// Same passphrase + params → same key
+	key2 := DeriveKey("test-passphrase", p)
+	if string(key) != string(key2) {
+		t.Fatal("same passphrase should produce same key")
+	}
+
+	// Different passphrase → different key
+	key3 := DeriveKey("other-passphrase", p)
+	if string(key) == string(key3) {
+		t.Fatal("different passphrase should produce different key")
+	}
+}
+
+func TestEncryptDecryptBytes(t *testing.T) {
+	p, _ := DefaultParams()
+	key := DeriveKey("test", p)
+	enc, err := NewEncryptor(key)
+	if err != nil {
+		t.Fatalf("NewEncryptor: %v", err)
+	}
+
+	plaintext := []byte("hello world")
+	ct, err := enc.Encrypt(plaintext)
+	if err != nil {
+		t.Fatalf("Encrypt: %v", err)
+	}
+
+	pt, err := enc.Decrypt(ct)
+	if err != nil {
+		t.Fatalf("Decrypt: %v", err)
+	}
+	if string(pt) != string(plaintext) {
+		t.Fatalf("expected %q, got %q", plaintext, pt)
+	}
+}
+
+func TestEncryptDecryptString(t *testing.T) {
+	p, _ := DefaultParams()
+	key := DeriveKey("test", p)
+	enc, _ := NewEncryptor(key)
+
+	original := "sensitive@email.com"
+	encoded, err := enc.EncryptString(original)
+	if err != nil {
+		t.Fatalf("EncryptString: %v", err)
+	}
+
+	decoded, err := enc.DecryptString(encoded)
+	if err != nil {
+		t.Fatalf("DecryptString: %v", err)
+	}
+	if decoded != original {
+		t.Fatalf("expected %q, got %q", original, decoded)
+	}
+}
+
+func TestDecryptWrongKey(t *testing.T) {
+	p, _ := DefaultParams()
+	key1 := DeriveKey("passphrase-1", p)
+	key2 := DeriveKey("passphrase-2", p)
+
+	enc1, _ := NewEncryptor(key1)
+	enc2, _ := NewEncryptor(key2)
+
+	ct, _ := enc1.Encrypt([]byte("secret"))
+	_, err := enc2.Decrypt(ct)
+	if err == nil {
+		t.Fatal("expected error decrypting with wrong key")
+	}
+}
+
+func TestDecryptTooShort(t *testing.T) {
+	p, _ := DefaultParams()
+	key := DeriveKey("test", p)
+	enc, _ := NewEncryptor(key)
+
+	_, err := enc.Decrypt([]byte("short"))
+	if err == nil {
+		t.Fatal("expected error for short ciphertext")
+	}
+}
+
+func TestNewEncryptorBadKeyLength(t *testing.T) {
+	_, err := NewEncryptor([]byte("too-short"))
+	if err == nil {
+		t.Fatal("expected error for bad key length")
+	}
+}
+
+func TestEncryptProducesDifferentCiphertext(t *testing.T) {
+	p, _ := DefaultParams()
+	key := DeriveKey("test", p)
+	enc, _ := NewEncryptor(key)
+
+	pt := []byte("same plaintext")
+	ct1, _ := enc.Encrypt(pt)
+	ct2, _ := enc.Encrypt(pt)
+
+	if string(ct1) == string(ct2) {
+		t.Fatal("two encryptions of same plaintext should differ (random nonce)")
+	}
+}
--- a/internal/database/database.go
+++ b/internal/database/database.go
@ -0,0 +1,47 @@
+package database
+
+import (
+	"database/sql"
+	"fmt"
+	"time"
+
+	_ "modernc.org/sqlite"
+)
+
+// Open creates a *sql.DB for a SQLite database file with sensible defaults.
+func Open(dbPath string) (*sql.DB, error) {
+	db, err := sql.Open("sqlite", dbPath)
+	if err != nil {
+		return nil, fmt.Errorf("sql.Open: %w", err)
+	}
+
+	db.SetMaxOpenConns(1)
+	db.SetMaxIdleConns(1)
+	db.SetConnMaxLifetime(0)
+
+	// Enable WAL mode and busy timeout for better concurrency.
+	for _, pragma := range []string{
+		"PRAGMA journal_mode=WAL",
+		"PRAGMA busy_timeout=5000",
+		"PRAGMA foreign_keys=ON",
+	} {
+		if _, err := db.Exec(pragma); err != nil {
+			db.Close()
+			return nil, fmt.Errorf("%s: %w", pragma, err)
+		}
+	}
+
+	if err := db.Ping(); err != nil {
+		db.Close()
+		return nil, fmt.Errorf("ping: %w", err)
+	}
+
+	return db, nil
+}
+
+// SetPoolForTest overrides pool settings (useful in tests with in-memory DBs).
+func SetPoolForTest(db *sql.DB) {
+	db.SetMaxOpenConns(1)
+	db.SetMaxIdleConns(1)
+	db.SetConnMaxLifetime(10 * time.Minute)
+}
--- a/internal/imports/import.go
+++ b/internal/imports/import.go
@ -0,0 +1,43 @@
+package imports
+
+import "fncConvertGui/internal/models"
+
+type CSVtoTransactionsFunc func(data string) ([]models.Transaction, error)
+
+type MappingVersion struct {
+	Name             string                `json:"name"`
+	CsvToTransaction CSVtoTransactionsFunc `json:"-"`
+}
+
+type Importer struct {
+	Name     string           `json:"name"`
+	Versions []MappingVersion `json:"versions"`
+}
+
+// ImporterInfo is the JSON-safe subset sent to the frontend.
+type ImporterInfo struct {
+	Name     string   `json:"name"`
+	Versions []string `json:"versions"`
+}
+
+var DefaultImporters = []Importer{
+	{
+		Name: "LZO",
+		Versions: []MappingVersion{
+			{Name: "1.0.0", CsvToTransaction: nil},
+		},
+	},
+}
+
+// ListImporters returns a frontend-friendly summary of all registered importers.
+func ListImporters() []ImporterInfo {
+	out := make([]ImporterInfo, len(DefaultImporters))
+	for i, imp := range DefaultImporters {
+		versions := make([]string, len(imp.Versions))
+		for j, v := range imp.Versions {
+			versions[j] = v.Name
+		}
+		out[i] = ImporterInfo{Name: imp.Name, Versions: versions}
+	}
+	return out
+}
--- a/internal/models/customer.go
+++ b/internal/models/customer.go
@ -0,0 +1,22 @@
+package models
+
+import "time"
+
+// Customer represents a full customer record.
+type Customer struct {
+	ID        int64     `json:"id"`
+	Name      string    `json:"name"`
+	Email     string    `json:"email"`
+	Phone     string    `json:"phone"`
+	Company   string    `json:"company"`
+	CreatedAt time.Time `json:"createdAt"`
+	UpdatedAt time.Time `json:"updatedAt"`
+}
+
+// CustomerListItem is a lighter representation for list views.
+type CustomerListItem struct {
+	ID      int64  `json:"id"`
+	Name    string `json:"name"`
+	Email   string `json:"email"`
+	Company string `json:"company"`
+}
--- a/internal/models/transaction.go
+++ b/internal/models/transaction.go
@ -0,0 +1,15 @@
+package models
+
+import "time"
+
+type Transaction struct {
+	ID          int64     `json:"id"`
+	From        string    `json:"from"`
+	To          string    `json:"to"`
+	BookingDate time.Time `json:"bookingDate"`
+	ValueDate   time.Time `json:"valueDate"`
+	Subject     string    `json:"subject"`
+	Value       int64     `json:"value"`
+	CreatedAt   time.Time `json:"createdAt"`
+	UpdatedAt   time.Time `json:"updatedAt"`
+}
--- a/internal/repository/customer_repository.go
+++ b/internal/repository/customer_repository.go
@ -0,0 +1,149 @@
+package repository
+
+import (
+	"database/sql"
+	"fmt"
+	"time"
+
+	"fncConvertGui/internal/crypto"
+	"fncConvertGui/internal/models"
+)
+
+// CustomerRepository handles customer CRUD with field-level encryption.
+type CustomerRepository struct {
+	db  *sql.DB
+	enc *crypto.Encryptor
+}
+
+// NewCustomerRepository creates a new repository.
+func NewCustomerRepository(db *sql.DB, enc *crypto.Encryptor) *CustomerRepository {
+	return &CustomerRepository{db: db, enc: enc}
+}
+
+// Create inserts a new customer, encrypting sensitive fields.
+func (r *CustomerRepository) Create(c *models.Customer) (int64, error) {
+	encName, err := r.enc.Encrypt([]byte(c.Name))
+	if err != nil {
+		return 0, fmt.Errorf("encrypt name: %w", err)
+	}
+	encEmail, err := r.enc.Encrypt([]byte(c.Email))
+	if err != nil {
+		return 0, fmt.Errorf("encrypt email: %w", err)
+	}
+	encPhone, err := r.enc.Encrypt([]byte(c.Phone))
+	if err != nil {
+		return 0, fmt.Errorf("encrypt phone: %w", err)
+	}
+
+	now := time.Now()
+	res, err := r.db.Exec(
+		`INSERT INTO customers (name, email, phone, company, created_at, updated_at)
+		 VALUES (?, ?, ?, ?, ?, ?)`,
+		encName, encEmail, encPhone, c.Company, now, now,
+	)
+	if err != nil {
+		return 0, fmt.Errorf("insert: %w", err)
+	}
+	return res.LastInsertId()
+}
+
+// GetByID fetches a customer by ID, decrypting sensitive fields.
+func (r *CustomerRepository) GetByID(id int64) (*models.Customer, error) {
+	var c models.Customer
+	var encName, encEmail, encPhone []byte
+
+	err := r.db.QueryRow(
+		`SELECT id, name, email, phone, company, created_at, updated_at
+		 FROM customers WHERE id = ?`, id,
+	).Scan(&c.ID, &encName, &encEmail, &encPhone, &c.Company, &c.CreatedAt, &c.UpdatedAt)
+	if err != nil {
+		return nil, fmt.Errorf("query: %w", err)
+	}
+
+	name, err := r.enc.Decrypt(encName)
+	if err != nil {
+		return nil, fmt.Errorf("decrypt name: %w", err)
+	}
+	email, err := r.enc.Decrypt(encEmail)
+	if err != nil {
+		return nil, fmt.Errorf("decrypt email: %w", err)
+	}
+	phone, err := r.enc.Decrypt(encPhone)
+	if err != nil {
+		return nil, fmt.Errorf("decrypt phone: %w", err)
+	}
+
+	c.Name = string(name)
+	c.Email = string(email)
+	c.Phone = string(phone)
+	return &c, nil
+}
+
+// List returns all customers with decrypted fields for list views.
+func (r *CustomerRepository) List() ([]models.CustomerListItem, error) {
+	rows, err := r.db.Query(
+		`SELECT id, name, email, company FROM customers ORDER BY id DESC`)
+	if err != nil {
+		return nil, fmt.Errorf("query: %w", err)
+	}
+	defer rows.Close()
+
+	var items []models.CustomerListItem
+	for rows.Next() {
+		var item models.CustomerListItem
+		var encName, encEmail []byte
+
+		if err := rows.Scan(&item.ID, &encName, &encEmail, &item.Company); err != nil {
+			return nil, fmt.Errorf("scan: %w", err)
+		}
+
+		name, err := r.enc.Decrypt(encName)
+		if err != nil {
+			return nil, fmt.Errorf("decrypt name: %w", err)
+		}
+		email, err := r.enc.Decrypt(encEmail)
+		if err != nil {
+			return nil, fmt.Errorf("decrypt email: %w", err)
+		}
+
+		item.Name = string(name)
+		item.Email = string(email)
+		items = append(items, item)
+	}
+	return items, rows.Err()
+}
+
+// Update modifies an existing customer, re-encrypting sensitive fields.
+func (r *CustomerRepository) Update(c *models.Customer) error {
+	encName, err := r.enc.Encrypt([]byte(c.Name))
+	if err != nil {
+		return fmt.Errorf("encrypt name: %w", err)
+	}
+	encEmail, err := r.enc.Encrypt([]byte(c.Email))
+	if err != nil {
+		return fmt.Errorf("encrypt email: %w", err)
+	}
+	encPhone, err := r.enc.Encrypt([]byte(c.Phone))
+	if err != nil {
+		return fmt.Errorf("encrypt phone: %w", err)
+	}
+
+	_, err = r.db.Exec(
+		`UPDATE customers SET name=?, email=?, phone=?, company=?, updated_at=?
+		 WHERE id=?`,
+		encName, encEmail, encPhone, c.Company, time.Now(), c.ID,
+	)
+	if err != nil {
+		return fmt.Errorf("update: %w", err)
+	}
+	return nil
+}
+
+// Delete removes a customer by ID.
+func (r *CustomerRepository) Delete(id int64) error {
+	_, err := r.db.Exec(`DELETE FROM customers WHERE id = ?`, id)
+	if err != nil {
+		return fmt.Errorf("delete: %w", err)
+	}
+	return nil
+}
--- a/main.go
+++ b/main.go
@ -25,6 +25,7 @@ func main() {
 		},
 		BackgroundColour: &options.RGBA{R: 27, G: 38, B: 54, A: 1},
 		OnStartup:        app.startup,
+		OnShutdown:       app.shutdown,
 		Bind: []interface{}{
 			app,
 		},