glimr/db/gen/migrate

Migration Generator

Compares current schema definitions against a stored snapshot to detect changes and automatically generate migration SQL.

The workflow is:

1. Load the previous schema snapshot from JSON
2. Scan current schema files in src/data/{conn_name}/models/
3. Compute the diff (new tables, dropped tables, column changes)
4. Generate driver-specific SQL (PostgreSQL or SQLite)
5. Write migration file to src/data/{conn_name}/_migrations/
6. Update the snapshot for next run

Supports column renames via the rename_from modifier, which is automatically cleaned up after migration generation.

Run with: gleam run -m glimr/db/gen/migrate

pub fn run(
  name: String,
  driver_type: String,
  model_filter: option.Option(List(String)),
) -> Nil