Module identity 

Allocate constraint incarnations and preserve legacy NOT NULL OIDs during initial migration.

Modules

claims

Read catalog addresses without binding expressions, resolving references or projecting query rows.

foreign_keys

Foreign-key catalog rows have independent identities even when partition copies share enforcement.

keys

Match attached key provenance to the local constraint incarnation through renames.

legacy

Preserve the public addresses of predecessor key and CHECK rows during initial conversion.

Functions

materialize_default_oid

StoreAttrDefault: a column’s default or generation expression has its own pg_attrdef row, whose OID it keeps until the expression is replaced. A column without one has no row.

materialize_key_identity

DefineIndex and index_constraint_create: a key’s enforcing index takes its OID, then the constraint takes its own.

materialize_not_null_identity

StoreRelNotNull: a NOT NULL constraint takes its incarnation and pg_constraint OID when it is stored.

migrate_constraint_metadata

Called only during the initial catalog transaction, before a legacy database becomes visible.

validate_not_null_identities