Prisma troubleshooting

Read replica

• I thought it didn't exist due to the Support for Read Replicas #172 issue.
• But it is provided in the form of middleware at prisma/prisma-read-replica-middleware.
• e.g. prisma/middleware-examples/prisma-read-replica-middleware

Data sources

• In the schema.prisma file, there can only be one datasource column.
• In case the data source changes, the migration.lock file must be deleted and the migration process must be run again.

Polymorphism

• Support for Polymorphic Associations #1644 It seems there is no current plan to support this.
• Polymorphic relationships are necessary in normalization but it de-normalizes by adding information to the column.