feat: initialize Next.js project with database schema

- Set up Next.js with App Router, TypeScript, Tailwind CSS
- Configure shadcn/ui with dark theme
- Install dependencies: lightweight-charts, papaparse, lucide-react
- Set up Drizzle ORM with better-sqlite3
- Create database schema for candles and annotations tables
- Generate migration SQL

src/lib/db/index.ts

@@ -0,0 +1,15 @@
+import Database from 'better-sqlite3';
+import { drizzle } from 'drizzle-orm/better-sqlite3';
+import * as schema from './schema';
+import path from 'path';
+import fs from 'fs';
+
+// Ensure data directory exists
+const dataDir = path.join(process.cwd(), 'data');
+if (!fs.existsSync(dataDir)) {
+  fs.mkdirSync(dataDir, { recursive: true });
+}
+
+const dbPath = path.join(dataDir, 'candles.db');
+const sqlite = new Database(dbPath);
+export const db = drizzle(sqlite, { schema });

src/lib/db/migrate.ts

@@ -0,0 +1,23 @@
+import Database from 'better-sqlite3';
+import { drizzle } from 'drizzle-orm/better-sqlite3';
+import { migrate } from 'drizzle-orm/better-sqlite3/migrator';
+import path from 'path';
+import fs from 'fs';
+
+export function runMigrations() {
+  // Ensure data directory exists
+  const dataDir = path.join(process.cwd(), 'data');
+  if (!fs.existsSync(dataDir)) {
+    fs.mkdirSync(dataDir, { recursive: true });
+  }
+
+  const dbPath = path.join(dataDir, 'candles.db');
+  const sqlite = new Database(dbPath);
+  const db = drizzle(sqlite);
+
+  // Run migrations
+  migrate(db, { migrationsFolder: './drizzle' });
+
+  sqlite.close();
+  console.log('✅ Migrations complete');
+}

src/lib/db/schema.ts

@@ -0,0 +1,18 @@
+import { sqliteTable, integer, real, text } from 'drizzle-orm/sqlite-core';
+
+export const candles = sqliteTable('candles', {
+  id: integer('id').primaryKey({ autoIncrement: true }),
+  time: integer('time').notNull().unique(),
+  open: real('open').notNull(),
+  high: real('high').notNull(),
+  low: real('low').notNull(),
+  close: real('close').notNull(),
+});
+
+export const annotations = sqliteTable('annotations', {
+  id: integer('id').primaryKey({ autoIncrement: true }),
+  timestamp: integer('timestamp').notNull(),
+  label_type: text('label_type').notNull(),
+  geometry: text('geometry'), // JSON string for line coordinates
+  created_at: integer('created_at').notNull(),
+});

src/lib/utils.ts

@@ -0,0 +1,6 @@
+import { type ClassValue, clsx } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}