To increase schema security we do not want to mix our own internal
objects with user objects. Since chunks are created in the
_timescaledb_internal schema our internal functions should live in
a different dedicated schema. This patch make the necessary
adjustments for the following functions:
- chunk_constraint_add_table_constraint(_timescaledb_catalog.chunk_constraint)
- chunk_drop_replica(regclass,name)
- chunk_index_clone(oid)
- chunk_index_replace(oid,oid)
- create_chunk_replica_table(regclass,name)
- drop_stale_chunks(name,integer[])
- health()
- hypertable_constraint_add_table_fk_constraint(name,name,name,integer)
- process_ddl_event()
- wait_subscription_sync(name,name,integer,numeric)
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