serials: Allow cascading delete of issuances from scap

Signed-off-by: Mike Rylander <mrylander@gmail.com>

diff --git a/Open-ILS/src/sql/Pg/upgrade/ZZZZ.schema.issuance_scap_fkey.sql b/Open-ILS/src/sql/Pg/upgrade/ZZZZ.schema.issuance_scap_fkey.sql
new file mode 100644 (file)
index 0000000..d27f8bc
--- /dev/null
+++ b/Open-ILS/src/sql/Pg/upgrade/ZZZZ.schema.issuance_scap_fkey.sql
@@ -0,0 +1,18 @@
+BEGIN;
+
+ALTER TABLE serial.issuance DROP CONSTRAINT IF EXISTS issuance_caption_and_pattern_fkey;
+
+-- Using NOT VALID and VALIDATE CONSTRAINT limits the impact to concurrent work.
+-- For details, see: https://www.postgresql.org/docs/current/static/sql-altertable.html
+
+ALTER TABLE serial.issuance ADD CONSTRAINT issuance_caption_and_pattern_fkey
+    FOREIGN KEY (caption_and_pattern)
+    REFERENCES serial.caption_and_pattern (id)
+    ON DELETE CASCADE
+    DEFERRABLE INITIALLY DEFERRED
+    NOT VALID;
+
+ALTER TABLE serial.issuance VALIDATE CONSTRAINT issuance_caption_and_pattern_fkey;
+
+COMMIT;
+