Bug Summary

When an EDA project's scm_branch is updated to a different Git tag (e.g. v1.0.0 to v1.1.0) and the project is synced, existing rulebook activations with event stream source mappings cannot be restarted. The API returns:

{'source_mappings': 'Rulebook has changed since the sources were mapped. Please reattach event streams'}

The root cause is that _sync_rulebook() in services/project/imports.py updates Rulebook.rulesets and Activation.rulebook_rulesets but never updates the rulebook_hash embedded inside Activation.source_mappings. The stale hash then fails the comparison in _validate_sources_with_event_streams().

Environment

• eda-server (main branch)

Steps to reproduce

1. Create an EDA project pointing to a Git repo at tag v1.0.0
2. Create an event stream
3. Create a rulebook activation using a rulebook from that project, with event stream source mappings attached (the API stores a rulebook_hash inside source_mappings)
4. Confirm the activation runs successfully
5. Update the EDA project's scm_branch from v1.0.0 to v1.1.0 (where the rulebook file has any text change, even a comment or whitespace)
6. Sync the project
7. Attempt to restart the activation

Actual results

Restart fails with HTTP 400:

{"errors": "{'source_mappings': 'Rulebook has changed since the sources were mapped. Please reattach event streams'}"}

The activation is set to error state. The user must manually edit the activation and re-attach event streams, even when the source definitions are functionally identical.

Expected results

When a project sync updates a rulebook's content, the rulebook_hash stored inside source_mappings on affected activations should be updated to match. Restart and enable operations should continue to work without manual re-attachment when the sources are structurally unchanged.

Additional information

Root cause spans two code paths:

1. src/aap_eda/services/project/imports.py, _sync_rulebook(): updates rulebook.rulesets and Activation.rulebook_rulesets via bulk update(), but does not touch Activation.source_mappings.

2. src/aap_eda/api/serializers/activation.py, _validate_sources_with_event_streams(): recomputes get_rulebook_hash(rulebook.rulesets) and compares it against the now-stale rulebook_hash in source_mappings.

Proposed fix: In _sync_rulebook(), when the content has changed, iterate over affected activations and rewrite the rulebook_hash inside each source_mappings entry to match the new hash. A draft patch is available.