Add junction between relays and schedules

Makefile

@@ -2,10 +2,12 @@
 build:
 	cargo build
 
-sqlx:
+sqlx-prepare:
 	rm ./emgauwa-dev.sqlite || true
 	cargo sqlx database create
 	cargo sqlx migrate run
+
+sqlx: sqlx-prepare
 	cargo sqlx prepare --workspace
 
 build-rpi:
@@ -15,7 +17,7 @@ clean-db:
 	rm ./emgauwa-dev.sqlite || true
 	rm ./emgauwa-core.sqlite || true
 	rm ./emgauwa-controller.sqlite || true
-	$(MAKE) sqlx
+	$(MAKE) sqlx-prepare
 
 fmt:
 	cargo +nightly fmt