Phase 3 Slice 5 Step F-2. BEFORE INSERT/UPDATE trigger on
paliad.projects rejects any write that binds proceeding_type_id to a
non-fristenrechner-category proceeding_types row. NULL is allowed.
PostgreSQL CHECK constraints can't reference other tables, so this
is the only way to evaluate the (proceeding_types.category =
'fristenrechner') predicate per row without restructuring the
existing FK relationship.
Trigger trades narrower FK + partial-unique-index approach for
keeping the existing schema reference (mig 027) untouched. Slice 9
or later may drop this trigger when the litigation category is
fully retired.
Error message is bilingual (German + English) so the Go handler can
either surface it verbatim OR — preferably — intercept the typed
service error first and emit a clean i18n string. mig 088 is
defence-in-depth; the Go service-layer validation is the primary
path.
Idempotent: CREATE OR REPLACE FUNCTION + DROP TRIGGER IF EXISTS
before CREATE TRIGGER.
mAi
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