Maintain

Keep the repository correct as the world underneath it moves, on both of its axes: the dbt project and the semantic layer. Drift is measured against a baseline, the .dex/snapshot.json fingerprint of the warehouse map and of each project layer. Detection is read-only; only reconcile proposes edits, and transform apply is the one door that writes them.

Procedure

Dex works in one loop: explore, transform, maintain. dex <command> below is the dex CLI; where it is not installed, run the same command through the skill's scripts/run.py wrapper. Each command prints one JSON envelope: read it and decide the next step from it. Step 1 only reads. Steps 2 to 5 change the project, so take them only when the task asks for a change; a question about the data stops after step 1 and reports what it found. Explore and maintain report findings and hand repair work to transform; only the transform workflow performs the project edits, migrations and dev builds described below.