add sqlite

mobile/services/db/migrations.ts

@@ -0,0 +1,79 @@
+import type { SQLiteDatabase } from 'expo-sqlite';
+import { DATABASE_VERSION } from './schema';
+
+type Migration = {
+  version: number;
+  up: (db: SQLiteDatabase) => Promise<void>;
+};
+
+const MIGRATIONS: Migration[] = [
+  {
+    version: 1,
+    up: async (db) => {
+      await db.execAsync(`
+PRAGMA journal_mode = 'wal';
+PRAGMA foreign_keys = ON;
+CREATE TABLE IF NOT EXISTS folders (
+  id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+  uri TEXT NOT NULL UNIQUE,
+  name TEXT NOT NULL,
+  "exists" INTEGER,
+  sync_status TEXT NOT NULL DEFAULT 'local',
+  added_at INTEGER NOT NULL,
+  parent_uri TEXT
+);
+CREATE TABLE IF NOT EXISTS files (
+  id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+  uri TEXT NOT NULL UNIQUE,
+  name TEXT NOT NULL,
+  folder_uri TEXT NOT NULL,
+  extension TEXT,
+  size INTEGER,
+  "type" TEXT,
+  "exists" INTEGER,
+  last_modified INTEGER,
+  sync_status TEXT NOT NULL DEFAULT 'local',
+  added_at INTEGER NOT NULL,
+  FOREIGN KEY (folder_uri) REFERENCES folders(uri) ON DELETE CASCADE
+);
+CREATE TABLE IF NOT EXISTS user_preferences (
+  "key" TEXT PRIMARY KEY NOT NULL,
+  "value" TEXT NOT NULL,
+  updated_at INTEGER NOT NULL
+);
+`);
+    },
+  },
+  {
+    version: 2,
+    up: async (db) => {
+      await db.execAsync(`
+CREATE INDEX IF NOT EXISTS idx_files_folder_uri ON files(folder_uri);
+`);
+    },
+  },
+];
+
+async function readUserVersion(db: SQLiteDatabase): Promise<number> {
+  const row = await db.getFirstAsync<{ user_version: number }>('PRAGMA user_version');
+  return row?.user_version ?? 0;
+}
+
+async function writeUserVersion(db: SQLiteDatabase, version: number): Promise<void> {
+  await db.execAsync(`PRAGMA user_version = ${version}`);
+}
+
+export async function migrateDatabase(
+  db: SQLiteDatabase,
+  targetVersion: number = DATABASE_VERSION,
+): Promise<void> {
+  let currentVersion = await readUserVersion(db);
+
+  for (const migration of MIGRATIONS) {
+    if (migration.version > currentVersion && migration.version <= targetVersion) {
+      await migration.up(db);
+      await writeUserVersion(db, migration.version);
+      currentVersion = migration.version;
+    }
+  }
+}