add automatic created_at and updated_at fields to schema

migrations/20240727123308_initial.sql

@@ -13,18 +13,6 @@ CREATE TABLE IF NOT EXISTS languages
 );
 
 
-CREATE FUNCTION lng_upd_trg_fn() RETURNS TRIGGER
-    LANGUAGE plpgsql AS
-$$
-BEGIN
-    NEW.updated_at = NOW();
-    RETURN NEW;
-END;
-$$;
-
-CREATE TRIGGER lng_upd_trg BEFORE UPDATE ON languages FOR EACH ROW EXECUTE FUNCTION lng_upd_trg_fn();
-
-
 
 
 CREATE TABLE IF NOT EXISTS problems
@@ -34,6 +22,8 @@ CREATE TABLE IF NOT EXISTS problems
     description  TEXT         NOT NULL,
     time_limit   INT          NOT NULL,
     memory_limit INT          NOT NULL,
+    created_at   TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    updated_at   TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
 
     PRIMARY KEY(id)
 );
@@ -47,6 +37,8 @@ CREATE TABLE IF NOT EXISTS contests
 (
     id          serial       NOT NULL,
     name        VARCHAR(300) NOT NULL,
+    created_at  TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    updated_at  TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
 
     PRIMARY KEY(id)
 );
@@ -226,11 +218,26 @@ END; $$ LANGUAGE plpgsql;
 
 CREATE TRIGGER new_subtask_trg AFTER INSERT ON subtasks FOR EACH ROW EXECUTE FUNCTION on_new_subtask();
 
+
+
+
+CREATE FUNCTION updated_at_update() RETURNS TRIGGER
+    LANGUAGE plpgsql AS
+$$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$;
+
+CREATE TRIGGER languages_upd_trg BEFORE UPDATE ON languages FOR EACH ROW EXECUTE FUNCTION updated_at_update();
+CREATE TRIGGER problems_upd_trg BEFORE UPDATE ON problems FOR EACH ROW EXECUTE FUNCTION updated_at_update();
+CREATE TRIGGER contests_upd_trg BEFORE UPDATE ON contests FOR EACH ROW EXECUTE FUNCTION updated_at_update();
 -- +goose StatementEnd
 
 -- +goose Down
 -- +goose StatementBegin
-DROP FUNCTION IF EXISTS lng_upd_trg_fn CASCADE;
+DROP FUNCTION IF EXISTS updated_at_update CASCADE;
 DROP FUNCTION IF EXISTS on_new_participant CASCADE;
 DROP FUNCTION IF EXISTS on_new_task CASCADE;
 DROP FUNCTION IF EXISTS on_new_subtask CASCADE;