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lib/db.ts

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+import Database from 'better-sqlite3';
+import path from 'path';
+import fs from 'fs';
+
+const DATA_DIR = process.env.DATA_DIR ?? path.join(process.cwd(), '.data');
+const UPLOADS_DIR = path.join(DATA_DIR, 'uploads');
+const DB_PATH = path.join(DATA_DIR, 'tally.db');
+
+// Ensure directories exist
+fs.mkdirSync(UPLOADS_DIR, { recursive: true });
+
+const db = new Database(DB_PATH, { timeout: 5000 });
+
+// Performance: WAL mode for concurrent reads + writes
+db.pragma('journal_mode = WAL');
+db.pragma('foreign_keys = ON');
+
+// Schema migrations
+db.exec(`
+  CREATE TABLE IF NOT EXISTS groups (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    name        TEXT    NOT NULL,
+    order_index INTEGER NOT NULL DEFAULT 0
+  );
+
+  CREATE TABLE IF NOT EXISTS counters (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    name        TEXT    NOT NULL,
+    value       INTEGER NOT NULL DEFAULT 0,
+    image_path  TEXT,
+    group_id    INTEGER REFERENCES groups(id) ON DELETE SET NULL,
+    order_index INTEGER NOT NULL DEFAULT 0
+  );
+
+  CREATE TABLE IF NOT EXISTS events (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    counter_id  INTEGER NOT NULL REFERENCES counters(id) ON DELETE CASCADE,
+    delta       INTEGER NOT NULL,
+    created_at  INTEGER NOT NULL
+  );
+  CREATE INDEX IF NOT EXISTS idx_events_counter ON events(counter_id);
+  CREATE INDEX IF NOT EXISTS idx_events_date    ON events(created_at);
+`);
+
+export { UPLOADS_DIR };
+export default db;