fix(postgres): use non-prepared statements for metadata queries (#4226)

* WIP fix(postgres): use non-prepared statements for metadata queries

* WIP fix(postgres): use non-prepared statements for metadata queries (2)

* WIP fix(postgres): use non-prepared statements for metadata queries (3)

* WIP fix(postgres): use non-prepared statements for metadata queries (5)

* WIP fix(postgres): use non-prepared statements for metadata queries (6)

* WIP fix(postgres): use non-prepared statements for metadata queries (7)

* WIP fix(postgres): use non-prepared statements for metadata queries (8)

* WIP fix(postgres): use non-prepared statements for metadata queries (9)

* WIP fix(postgres): use non-prepared statements for metadata queries (10)