Use TEXT instead of VARCHAR(n), since PostgreSQL treats them the same except for a limit

synapse/storage/schema/delta/12/v12.sql

synapse/storage/schema/delta/13/v13.sql

synapse/storage/schema/delta/14/v14.sql

synapse/storage/schema/delta/15/appservice_txns.sql

synapse/storage/schema/delta/16/users.sql

synapse/storage/schema/full_schemas/11/event_edges.sql

synapse/storage/schema/full_schemas/11/event_signatures.sql

synapse/storage/schema/full_schemas/11/im.sql

synapse/storage/schema/full_schemas/11/keys.sql

synapse/storage/schema/full_schemas/11/media_repository.sql

synapse/storage/schema/full_schemas/11/presence.sql

synapse/storage/schema/full_schemas/11/profiles.sql

synapse/storage/schema/full_schemas/11/redactions.sql

synapse/storage/schema/full_schemas/11/room_aliases.sql

synapse/storage/schema/full_schemas/11/state.sql

synapse/storage/schema/full_schemas/11/transactions.sql

synapse/storage/schema/full_schemas/11/users.sql

...e/storage/schema/full_schemas/16/application_services.sql

synapse/storage/schema/full_schemas/16/event_edges.sql

synapse/storage/schema/full_schemas/16/event_signatures.sql