306bb11618
Migration 077 adds paliad.projects.counterclaim_of (nullable FK ON DELETE SET NULL) plus a partial index. A trigger function rejects two-level CCR chains: a project with counterclaim_of NOT NULL cannot be the target of another CCR — UPC practice has no CCR-of-a-CCR shape, so reject it at the schema level rather than defending in the application layer. ProjectService gains LoadCounterclaimChildrenVisible (list visible CCR sub-projects against a parent) and CreateCounterclaim (atomic: project row + creator-as-lead team membership + audit rows on parent AND child). The CCR child is placed as a sibling under the same patent (§4.4), our side flips claimant↔defendant by default with a "Stimmt nicht?" override for the R.49.2.b CCI edge case, and the proceeding type defaults to UPC_REV. Title auto-suggests from the patent ancestor's patent_number when available. Tracker advances 76 → 77.
90 lines
3.8 KiB
PL/PgSQL
90 lines
3.8 KiB
PL/PgSQL
-- t-paliad-174 — SmartTimeline Slice 3.
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-- Two structural additions for the counterclaim sub-project shape
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-- (§4 of docs/design-smart-timeline-2026-05-08.md):
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--
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-- 1. paliad.projects.counterclaim_of — nullable FK referencing
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-- paliad.projects(id) ON DELETE SET NULL. When non-NULL the row
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-- represents the CCR (counterclaim) sub-project filed against the
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-- target row. Standard parent_id keeps governing the project tree;
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-- counterclaim_of is the *additional* relation describing the CCR
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-- link. parent_id of the CCR child is set to the target's parent
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-- (sibling-under-patent placement, §4.4) — that placement is owned
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-- by ProjectService.CreateCounterclaim, not the schema.
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--
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-- 2. Two-level-CCR rejection trigger — UPC practice does NOT have
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-- counterclaim-of-a-counterclaim chains. Reject the malformed shape
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-- at the schema level so the application can never write it. CHECK
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-- can't reference other rows; trigger function raises explicitly.
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--
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-- Idempotent: re-applying is a no-op. Tracker advances 76 → 77.
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-- 1. paliad.projects.counterclaim_of ---------------------------------------
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ALTER TABLE paliad.projects
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ADD COLUMN IF NOT EXISTS counterclaim_of uuid NULL
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REFERENCES paliad.projects(id) ON DELETE SET NULL;
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COMMENT ON COLUMN paliad.projects.counterclaim_of IS
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'When non-NULL this project is the CCR (counterclaim) filed against '
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'the referenced parent project. parent_id continues to govern the '
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'project tree (CCR is placed as a sibling under the same patent — '
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'see ProjectService.CreateCounterclaim). ON DELETE SET NULL keeps '
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'the CCR row alive when the parent is hard-deleted (rare; default '
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'is archival) so the audit trail survives.';
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CREATE INDEX IF NOT EXISTS projects_counterclaim_of_idx
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ON paliad.projects (counterclaim_of)
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WHERE counterclaim_of IS NOT NULL;
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-- 2. Two-level-CCR rejection trigger ---------------------------------------
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CREATE OR REPLACE FUNCTION paliad.projects_no_two_level_ccr() RETURNS trigger
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LANGUAGE plpgsql AS $$
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BEGIN
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-- A project that is itself a CCR may NOT be the target of another CCR.
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-- Two cases to reject:
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--
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-- (a) NEW row points at a parent that is itself a CCR:
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-- NEW.counterclaim_of -> some row with counterclaim_of NOT NULL.
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--
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-- (b) NEW row claims to be a CCR (NEW.counterclaim_of IS NOT NULL)
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-- but already has another CCR pointing AT it (NEW.id is the
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-- target of some other row's counterclaim_of). The cleaner
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-- phrasing: "no row may simultaneously have a CCR child AND
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-- a CCR parent".
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IF NEW.counterclaim_of IS NOT NULL THEN
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IF EXISTS (
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SELECT 1 FROM paliad.projects p
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WHERE p.id = NEW.counterclaim_of
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AND p.counterclaim_of IS NOT NULL
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) THEN
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RAISE EXCEPTION
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'two-level counterclaim chains are not allowed: parent project % is itself a counterclaim',
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NEW.counterclaim_of;
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END IF;
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IF EXISTS (
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SELECT 1 FROM paliad.projects p
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WHERE p.counterclaim_of = NEW.id
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) THEN
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RAISE EXCEPTION
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'project % already has a counterclaim child and cannot itself be a counterclaim',
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NEW.id;
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END IF;
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END IF;
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RETURN NEW;
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END;
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$$;
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COMMENT ON FUNCTION paliad.projects_no_two_level_ccr() IS
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'Rejects two-level counterclaim chains. UPC practice does not have '
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'CCR-of-a-CCR; reject the malformed shape at write time so the app '
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'layer never has to defend against it. See migration 077.';
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DROP TRIGGER IF EXISTS projects_no_two_level_ccr ON paliad.projects;
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CREATE TRIGGER projects_no_two_level_ccr
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BEFORE INSERT OR UPDATE OF counterclaim_of ON paliad.projects
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FOR EACH ROW
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EXECUTE FUNCTION paliad.projects_no_two_level_ccr();
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