migrate

Migration Generator

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

The workflow is:

Load the previous schema snapshot from JSON
Scan current schema files in src/data/models/
Compute the diff (new tables, dropped tables, column changes)
Generate driver-specific SQL (PostgreSQL or SQLite)
Write migration file to src/data/_migrations/
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

Values

main

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pub fn main() -> Nil

Main

Entry point for the migration generator CLI. Run with: gleam run -m glimr/db/gen/migrate

run

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

Run

Run migration generation with an optional model filter. When a filter is provided, only those models are scanned and the snapshot is merged rather than replaced.