Bug Fixes

• add retryWrites to MongoConnectionOptions (#8354) (c895680), closes #7869
• create typeorm_metadata table when running migrations (#4956) (b2c8168)
• db caching won't work with replication enabled (#7694) (2d0abe7), closes #5919
• incorrect composite UNIQUE constraints detection (#8364) (29cb891), closes #8158
• Postgres enum generates unnecessary queries on schema sync (#8268) (98d5f39)
• resolve issue delete column null on after update event subscriber (#8318) (8a5e671), closes #6327

Features

• export interfaces from schema-builder/options (#8383) (7b8a1e3)
• implement generated columns for postgres 12 driver (#6469) (91080be)
• lock modes in cockroachdb (#8250) (d494fcc), closes #8249