PRACTICAL FIELD GUIDE
Add a required column to a table with existing rows
A new required column needs a value for rows that already exist. MCPBackend requires a default for supported not-null column additions, but the default must also make sense for existing data.
MCPBackend editorial team · · Examples are illustrative
Put it into practice
- Inspect representative existing records and choose an accurate initial value.
- Add the column through the supported schema flow with an allowed default.
- Verify old and new records, then update the application to send deliberate values going forward.
What this looks like
ILLUSTRATIVE EXAMPLE
A tasks table gains a required status column with a draft default. Existing rows remain readable while the frontend learns the new field.
A boundary to keep clear
Do not use a misleading business value simply to satisfy a migration. Plan a separate backfill where historical rows need different values.
MCPBackend context
MCPBackend stores each project's data in SQLite and exposes supported tables through generated REST endpoints. Use the schema tools and dashboard for supported changes. The design examples here are patterns to adapt, not claims that the API exposes every SQLite feature or arbitrary SQL.
Take the next step
Inspect the current project contract, try the change with disposable data, and verify the result through the same credentials your app will use. Record the expected response and one denied-access case before release.
Sources and further reading
These references explain the underlying protocols and design principles. For supported MCPBackend operations and exact request shapes, inspect your project’s generated API contract.