Add role name function and add an admin/admin user

migrations/20230716212933_create_role_name_function.down.sql

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+-- Add down migration script here
+DROP FUNCTION IF EXISTS role_name(INT, INT);

migrations/20230716212933_create_role_name_function.up.sql

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+-- Add up migration script here
+CREATE FUNCTION role_name(role_id INT, lang_id INT)
+RETURNS TEXT
+AS $$
+SELECT
+  COALESCE(
+    MAX(a.name),
+    MAX(b.name),
+    MAX(c.name
+  )) AS name
+FROM roles
+LEFT JOIN role_names a ON a.role = roles.id AND a.language = lang_id
+LEFT JOIN role_names b ON b.role = roles.id AND b.language = 1
+LEFT JOIN role_names c ON c.role = roles.id
+WHERE roles.id = role_id
+GROUP BY roles.id;
+$$ LANGUAGE SQL;

migrations/20230716213851_add_users.down.sql

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+-- Add down migration script here
+DELETE FROM users
+	WHERE id=1;

migrations/20230716213851_add_users.up.sql

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+-- Add up migration script here
+-- admin/admin login
+INSERT INTO users
+	(id, user_name, pass_hash)
+VALUES
+	(1, 'admin', '$2y$10$eoghV7BDZSDDKAjjYuESUuMwl3IqFBzawFybgkBKWl.CKlI6jXAQ.');