Use hooks and data events

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Purpose

Place record defaults, validation, and lifecycle reactions at the server-side data boundary so every API, Script, Function, test, and internal service follows the same rules.

Choose a mechanism

Requirement	Recommended mechanism
Field default	Field default or initValue hook
Write validation	validateWrite hook or onValidating event
Delete validation	validateDelete hook or onDeleting event
Lifecycle reaction	Data event
Explicit user operation	Function
Multiple registrations	Script
External/native integration	Reviewed TypeScript

Write lifecycle

flowchart LR
    A[Permission check] --> B[Field validation]
    B --> C[onValidating]
    C --> D[validateWrite hook]
    D --> E[onInserting or onUpdating]
    E --> F[SQLite write]
    F --> G[onInserted or onUpdated]

Pre-events can cancel. Post-events cannot cancel an operation that has already completed.

Hooks

interface TableHooks {
  initValue?(record: Record, ctx: DataContext): void;
  validateWrite?(record: Record, ctx: DataContext): boolean | void;
  validateDelete?(record: Record, ctx: DataContext): boolean | void;
}

Returning false blocks a validation operation. Throwing ValidationError provides a useful message.

Events

Event	Stage	Can cancel?
onValidating	Common write validation	Yes
onInserting	Before insert	Yes
onInserted	After insert	No
onUpdating	Before update	Yes
onUpdated	After update	No
onDeleting	Before delete	Yes
onDeleted	After delete	No

Event handlers receive the table, event type, record, authenticated context, and cancel(reason) function. Reference delete behavior can be restrict, setNull, or cascade; child writes still follow their normal lifecycle.

Testing

Test valid writes, rejected writes, rollback, authorization, update validation, delete behavior, and the fact that post-events cannot cancel. Keep business rules deterministic and avoid network calls inside transactions.

Related topics

Scripts · Functions and actions · Business logic · Security