Описание изменений

backend/db/migrations/006_guest_messages.sql

@@ -0,0 +1,52 @@
+CREATE TABLE IF NOT EXISTS guest_messages (
+  id SERIAL PRIMARY KEY,
+  guest_id VARCHAR(255) NOT NULL,
+  content TEXT NOT NULL,
+  language VARCHAR(10) DEFAULT 'en',
+  is_ai BOOLEAN DEFAULT false,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+DO $$ 
+BEGIN 
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_indexes 
+    WHERE tablename = 'guest_messages' AND indexname = 'idx_guest_messages_guest_id'
+  ) THEN
+    CREATE INDEX idx_guest_messages_guest_id ON guest_messages(guest_id);
+  END IF;
+END $$;
+
+DO $$ 
+BEGIN 
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.columns 
+    WHERE table_name = 'messages' AND column_name = 'guest_message_id'
+  ) THEN
+    ALTER TABLE messages ADD COLUMN guest_message_id INTEGER;
+  END IF;
+END $$;
+
+DO $$ 
+BEGIN 
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_constraint 
+    WHERE conname = 'fk_messages_guest_message'
+  ) THEN
+    ALTER TABLE messages
+    ADD CONSTRAINT fk_messages_guest_message
+    FOREIGN KEY (guest_message_id)
+    REFERENCES guest_messages(id)
+    ON DELETE SET NULL;
+  END IF;
+END $$;
+
+DO $$ 
+BEGIN 
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_indexes 
+    WHERE tablename = 'messages' AND indexname = 'idx_messages_guest_message_id'
+  ) THEN
+    CREATE INDEX idx_messages_guest_message_id ON messages(guest_message_id);
+  END IF;
+END $$;