v0.12.49 family rules update

backend/src/models/migrations/016_guardian_partners.sql

@@ -0,0 +1,16 @@
+-- 016_guardian_partners.sql
+-- Partner/spouse relationship between guardians.
+-- Partners share the same child alias list (both can manage it) and can
+-- respond to events on behalf of each other within shared user groups.
+
+CREATE TABLE IF NOT EXISTS guardian_partners (
+  id         SERIAL PRIMARY KEY,
+  user_id_1  INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  user_id_2  INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  UNIQUE (user_id_1, user_id_2),
+  CHECK (user_id_1 < user_id_2)
+);
+
+CREATE INDEX IF NOT EXISTS idx_guardian_partners_user1 ON guardian_partners(user_id_1);
+CREATE INDEX IF NOT EXISTS idx_guardian_partners_user2 ON guardian_partners(user_id_2);