data table sql files

scripts/table_schema.sql

@@ -0,0 +1,12 @@
+-- Create the messages table
+CREATE TABLE IF NOT EXISTS messages (
+    id BIGSERIAL PRIMARY KEY,
+    conversation_id TEXT NOT NULL,
+    message_type VARCHAR(10) NOT NULL CHECK (message_type IN ('human', 'ai', 'tool')),
+    content TEXT NOT NULL,
+    sequence_number INTEGER NOT NULL CHECK (sequence_number >= 0),
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+-- Index for fast retrieval of all messages in a conversation (in order)
+CREATE INDEX IF NOT EXISTS idx_messages_conversation ON messages (conversation_id, sequence_number);