feat(web): add SQLite schema and connection

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/server/db/index.ts

@@ -0,0 +1,28 @@
+import Database from 'better-sqlite3';
+import path from 'path';
+import fs from 'fs';
+import { fileURLToPath } from 'url';
+import { SCHEMA_SQL } from './schema';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const DB_PATH = path.resolve(__dirname, '..', '..', 'data', 'meitu-agent.db');
+
+let db: Database.Database;
+
+export function getDb(): Database.Database {
+  if (!db) {
+    const dir = path.dirname(DB_PATH);
+    if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
+    db = new Database(DB_PATH);
+    db.pragma('journal_mode = WAL');
+    db.pragma('foreign_keys = ON');
+  }
+  return db;
+}
+
+export function initDb(): void {
+  const d = getDb();
+  d.exec(SCHEMA_SQL);
+}

web/server/db/schema.ts

@@ -0,0 +1,49 @@
+export const SCHEMA_SQL = `
+  CREATE TABLE IF NOT EXISTS conversations (
+    id TEXT PRIMARY KEY,
+    title TEXT NOT NULL,
+    account_id TEXT,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+
+  CREATE TABLE IF NOT EXISTS messages (
+    id TEXT PRIMARY KEY,
+    conversation_id TEXT NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
+    role TEXT NOT NULL CHECK(role IN ('user', 'assistant', 'system', 'tool')),
+    content TEXT NOT NULL,
+    tool_calls TEXT,
+    created_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+
+  CREATE TABLE IF NOT EXISTS assets (
+    id TEXT PRIMARY KEY,
+    account_id TEXT,
+    manifest_path TEXT,
+    type TEXT NOT NULL CHECK(type IN ('image', 'video')),
+    file_path TEXT NOT NULL,
+    url TEXT,
+    shot_index INTEGER,
+    created_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+
+  CREATE TABLE IF NOT EXISTS pipeline_runs (
+    id TEXT PRIMARY KEY,
+    manifest_path TEXT NOT NULL,
+    phase TEXT NOT NULL,
+    status TEXT NOT NULL DEFAULT 'pending' CHECK(status IN ('pending','running','done','failed')),
+    started_at TEXT,
+    finished_at TEXT
+  );
+
+  CREATE TABLE IF NOT EXISTS configs (
+    id TEXT PRIMARY KEY,
+    key TEXT NOT NULL UNIQUE,
+    value TEXT NOT NULL DEFAULT '{}',
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+
+  CREATE INDEX IF NOT EXISTS idx_messages_conv ON messages(conversation_id, created_at);
+  CREATE INDEX IF NOT EXISTS idx_assets_account ON assets(account_id, created_at);
+  CREATE INDEX IF NOT EXISTS idx_pipeline_manifest ON pipeline_runs(manifest_path);
+`;