feat: hltb plugin

internal/migration/migrations.go

@@ -9,6 +9,7 @@ func init() {
 	// Register migrations
 	Register(1, "Initial schema with bcrypt passwords", migrateInitialSchemaUp, migrateInitialSchemaDown)
 	Register(2, "Add reminders table", migrateRemindersUp, migrateRemindersDown)
+	Register(3, "Add cache table", migrateCacheUp, migrateCacheDown)
 }
 
 // Initial schema creation with bcrypt passwords - version 1
@@ -126,3 +127,30 @@ func migrateRemindersDown(db *sql.DB) error {
 	_, err := db.Exec(`DROP TABLE IF EXISTS reminders`)
 	return err
 }
+
+// Add cache table - version 3
+func migrateCacheUp(db *sql.DB) error {
+	_, err := db.Exec(`
+		CREATE TABLE IF NOT EXISTS cache (
+			key TEXT PRIMARY KEY,
+			value TEXT NOT NULL,
+			expires_at TIMESTAMP,
+			created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+			updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+		)
+	`)
+	if err != nil {
+		return err
+	}
+
+	// Create index on expires_at for efficient cleanup
+	_, err = db.Exec(`
+		CREATE INDEX IF NOT EXISTS idx_cache_expires_at ON cache(expires_at)
+	`)
+	return err
+}
+
+func migrateCacheDown(db *sql.DB) error {
+	_, err := db.Exec(`DROP TABLE IF EXISTS cache`)
+	return err
+}