i think i added push notifications to backend but im going to sleep now and ill finish frontend later

backend/init.sql

@@ -55,6 +55,32 @@ CREATE TABLE IF NOT EXISTS public.users
     CONSTRAINT unique_email UNIQUE (email)
 );
 
+
+CREATE TABLE IF NOT EXISTS public.device_tokens
+(
+    id uuid NOT NULL DEFAULT uuid_generate_v4(),
+    user_id uuid NOT NULL,
+    fcm_token text NOT NULL,
+    updated_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT device_tokens_pkey PRIMARY KEY (id),
+
+    CONSTRAINT fk_device_tokens_user
+        FOREIGN KEY (user_id)
+        REFERENCES public.users(id)
+        ON DELETE CASCADE,
+
+    CONSTRAINT uq_device_tokens_fcm_token
+        UNIQUE (fcm_token)
+);
+
+CREATE INDEX idx_device_tokens_user_id
+    ON public.device_tokens(user_id);
+
+
+
+
+
 ALTER TABLE IF EXISTS public.alt_subject
     ADD CONSTRAINT alt_subject_subject_id_fkey FOREIGN KEY (subject_id)
     REFERENCES public.subjects (id) MATCH SIMPLE