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# Base de datos, PRAGMAs y migraciones
PRAGMAs por defecto (src/db.ts)
- busy_timeout = 5000 ms
- journal_mode = WAL (si no es soportado, SQLite ajusta)
- synchronous = NORMAL
- wal_autocheckpoint = 1000
- foreign_keys = ON
Formato de timestamps
- Persistencia como 'YYYY-MM-DD HH:MM:SS[.mmm]'.
- Uso de strftime('%Y-%m-%d %H:%M:%f', 'now') en inserciones/updates.
Esquema funcional (resumen)
- users
- user_id (PK), created_at, updated_at.
- user_aliases
- alias (PK), user_id (FK → users), source, created_at, updated_at.
- groups
- id (PK, JID), name, active (boolean), last_verified (timestamp).
- allowed_groups
- group_id (PK, JID), label (TEXT | null), status ('pending'|'allowed'|'blocked'),
discovered_at, updated_at, discovered_by (TEXT | null).
- group_members
- group_id (FK → groups), user_id (FK → users), is_admin (boolean), is_active (boolean),
first_seen_at, last_seen_at, last_role_change_at.
- user_preferences
- user_id (FK → users), reminder_freq ('daily'|'weekly'|'weekdays'|'off'),
reminder_time ('HH:MM' | null), last_reminded_on ('YYYY-MM-DD' | null), updated_at.
- tasks
- id (PK autoinc), description, due_date ('YYYY-MM-DD' | null), group_id (JID | null),
created_by (user_id), created_at.
- task_assignments
- task_id (FK → tasks), user_id (FK → users), assigned_by (user_id), assigned_at.
- response_queue
- id (PK), recipient (user_id/JID), message (texto), metadata (JSON | null),
status ('queued'|'processing'|'sent'|'failed'),
attempts (int), next_attempt_at (timestamp | null),
last_error (TEXT | null), last_status_code (INT | null),
created_at (timestamp), updated_at (timestamp).
Nota: El detalle exacto está en las migraciones (src/db/migrations). Usa tableHasColumn para detectar columnas en migraciones idempotentes.
Migraciones
- Política up-only con checksum estático por migración.
- Migrator.migrateToLatest(instancia, opciones) se invoca en initializeDatabase() y en server.start().
- Tests utilizan Database(':memory:') y initializeDatabase(memdb) para asegurar el esquema.
Integridad y rendimiento
- foreign_keys = ON asegura relaciones consistentes.
- WAL mejora concurrencia de lectura/escritura.
- busy_timeout y synchronous=NORMAL balancean seguridad y rendimiento.