Task 16's security group rehoming (fusion_accounting → fusion_accounting_core)
only existed in post-migration. That flow fails on fresh pre-Phase-0 upgrades:
data-load runs before post-migration and looks up group xml-ids by
(module, name); if the row still has module='fusion_accounting', Odoo
creates a duplicate res.groups record under
module='fusion_accounting_core'. The subsequent post-migration
UPDATE...SET module='fusion_accounting_core' then trips the (module, name)
unique constraint on ir_model_data, rolling back the whole transaction.
Pre-migration runs BEFORE data-load, renames the five security xml-ids
(module_category, privilege, three groups) to the new module, so data-load
finds the existing rows and UPDATEs them in place. Existing user-group
links via res_groups_users_rel are preserved.
The post-migration is kept as an idempotent safety net (docstring
updated to reflect the new division of labour).
Verified on westin-v19 by simulating the pre-Phase-0 state (UPDATE
ir_model_data SET module='fusion_accounting' ...) and re-running the
upgrade: 5 rows renamed cleanly, zero duplicates, no errors.
Made-with: Cursor
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