Описание изменений

backend/db/migrations/005_messages.sql

@@ -0,0 +1,20 @@
+CREATE TABLE IF NOT EXISTS messages (
+  id SERIAL PRIMARY KEY,
+  conversation_id INTEGER REFERENCES conversations(id) ON DELETE CASCADE,
+  sender_type VARCHAR(20) NOT NULL,
+  sender_id INTEGER,
+  content TEXT,
+  channel VARCHAR(20) NOT NULL,
+  metadata JSONB,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  role VARCHAR(20) NOT NULL DEFAULT 'user',
+  guest_message_id INTEGER,
+  tokens_used INTEGER DEFAULT 0,
+  is_processed BOOLEAN DEFAULT FALSE
+);
+
+CREATE INDEX IF NOT EXISTS idx_messages_conversation_id ON messages(conversation_id);
+CREATE INDEX IF NOT EXISTS idx_messages_sender_type ON messages(sender_type);
+CREATE INDEX IF NOT EXISTS idx_messages_created_at ON messages(created_at);
+CREATE INDEX IF NOT EXISTS idx_messages_channel ON messages(channel);
+CREATE INDEX IF NOT EXISTS idx_messages_metadata ON messages USING gin(metadata);