Go back to storing JSON in TEXT

synapse/storage/_base.py

synapse/storage/appservice.py

synapse/storage/engines/postgres.py

synapse/storage/engines/sqlite3.py

synapse/storage/events.py

synapse/storage/profile.py

synapse/storage/registration.py

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

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

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

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