From 3423ac2e7e9c5e53df03e5d6c833292639bb77e4 Mon Sep 17 00:00:00 2001
From: Yvv <yves@pervier.com>
Date: Sat, 25 Apr 2026 02:57:39 +0200
Subject: [PATCH] Migrations : fix ADD CONSTRAINT IF NOT EXISTS (syntaxe
 PostgreSQL invalide)
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Remplace par un bloc DO $$ IF NOT EXISTS ... $$ pour le FK circulaire
item_versions→document_items. Testé localement sur pg-test : 5 migrations
OK + idempotence OK.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 ...2026_04_23_0000-0b9c1d2e3f4a_initial_schema.py | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/backend/alembic/versions/2026_04_23_0000-0b9c1d2e3f4a_initial_schema.py b/backend/alembic/versions/2026_04_23_0000-0b9c1d2e3f4a_initial_schema.py
index 4b47683..92d0bdf 100644
--- a/backend/alembic/versions/2026_04_23_0000-0b9c1d2e3f4a_initial_schema.py
+++ b/backend/alembic/versions/2026_04_23_0000-0b9c1d2e3f4a_initial_schema.py
@@ -232,9 +232,18 @@ def upgrade() -> None:
     """)
 
     op.execute("""
-    ALTER TABLE item_versions
-        ADD CONSTRAINT IF NOT EXISTS item_versions_item_id_fkey
-        FOREIGN KEY (item_id) REFERENCES document_items(id)
+    DO $$
+    BEGIN
+        IF NOT EXISTS (
+            SELECT 1 FROM information_schema.table_constraints
+            WHERE constraint_name = 'item_versions_item_id_fkey'
+            AND table_name = 'item_versions'
+        ) THEN
+            ALTER TABLE item_versions
+                ADD CONSTRAINT item_versions_item_id_fkey
+                FOREIGN KEY (item_id) REFERENCES document_items(id);
+        END IF;
+    END $$
     """)
 
     op.execute("""