Merge branch 'constraint-oops' into '2.8.4-DEVELOPMENT'

make sure people can't create duplicate entries in the matrix

See merge request !1675

shared/workspaces/alembic/versions/d822cf6844bb_create_matrix_tables.py

@@ -24,7 +24,8 @@ create_capabilities_bridge_table = """CREATE TABLE IF NOT EXISTS casa_matrix_cap
     capability_name varchar,
     matrix_id int,
     CONSTRAINT casa_matrix_capabilities_capability_name_fkey FOREIGN KEY (capability_name) REFERENCES capabilities (capability_name),
-    CONSTRAINT casa_matrix_capabilities_matrix_id_fkey FOREIGN KEY (matrix_id) REFERENCES casa_matrix_casa_versions (matrix_id)
+    CONSTRAINT casa_matrix_capabilities_matrix_id_fkey FOREIGN KEY (matrix_id) REFERENCES casa_matrix_casa_versions (matrix_id),
+    UNIQUE (capability_name, matrix_id)
 );"""
 
 create_cap_name_index = """CREATE INDEX IF NOT EXISTS casa_matrix_capabilities_capability_name_idx ON casa_matrix_capabilities(capability_name);"""