Schema Feature Support

This page records d1pac's current desired-state coverage. SQLite and D1 support only a limited set of direct alterations, so many changes use a table rebuild: create a replacement table, copy same-named columns, replace the original, and recreate its indexes and triggers.

Tables and columns

Feature	Status	Planned behavior
Create table	Native	CREATE TABLE; requires AllowCreate.
Drop table	Destructive	DROP TABLE; requires drop authorization.
Add trailing nullable/defaulted column	Native	ALTER TABLE ... ADD COLUMN; requires AllowAlter.
Other column additions	Migration	Table rebuild; new constraints and defaults are validated.
Drop column	Destructive	Table rebuild copying remaining same-named columns; requires drop authorization.
Change type, default, or nullability	Migration	Table rebuild copying same-named values into the desired definition.
Rename a column	Not inferred	Treated as an added column plus a removed column; the old values are not copied.

Integrity constraints

Feature	Status	Planned behavior
Primary key	Migration	Table rebuild and validation.
Foreign key	Migration	Table rebuild and validation.
Unique constraint	Migration	Table rebuild and validation.
Check constraint	Migration	Table rebuild and validation.
Referenced-table rebuild	Blocked	Automatically blocked when another table references the target.

Other schema objects

Feature	Status	Planned behavior
Index	Create/drop/replace	Definition changes use DROP INDEX followed by CREATE INDEX.
View	Create/drop/replace	Definition changes use DROP VIEW followed by CREATE VIEW.
Trigger	Create/drop/replace	Definition changes use DROP TRIGGER followed by CREATE TRIGGER.
Schemas, extensions, routines, enums, domains, sequences	Not applicable	These PostgreSQL object types are not part of SQLite/D1.
Object comments, owners, and privileges	Not modeled	No desired-state operations are planned for them.

Permissions and failure behavior

• AllowCreate controls new objects.
• AllowAlter controls direct alterations, replacements, and table rebuilds.
• AllowDrop or --allow-drop controls removed objects and columns.
• Disabled or unsafe operations remain visible as commented blocked-* plan entries.
• UseTransaction="true" submits the change as one batch; existing values must satisfy the desired types and constraints.
• Large rebuilds remain subject to Cloudflare D1 request and execution limits.
• StopOnDataLossRisk is recorded but is not an additional enforcement gate.

See the safety model for rebuild and authorization details.