Подключение к Postgres и тестовый эндпоинт авторизации

migrations/2025-03-21-212723_create_fcm/down.sql

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+DROP TABLE fcm;

migrations/2025-03-21-212723_create_fcm/up.sql

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+CREATE TABLE fcm
+(
+    user_id text PRIMARY KEY NOT NULL,
+    token   text             NOT NULL,
+    topics  text[]           NULL
+);
+
+CREATE UNIQUE INDEX fcm_user_id_key ON fcm USING btree (user_id);
+
+ALTER TABLE fcm
+    ADD CONSTRAINT fcm_user_id_fkey FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE RESTRICT ON UPDATE CASCADE;