persisting in postgres

schema.sql

@@ -0,0 +1,18 @@
+CREATE TABLE conversations (
+  id          UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+  name        TEXT        NOT NULL UNIQUE,
+  inserted_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE messages (
+  id                UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+  conversation_id   UUID        NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
+  role              TEXT        NOT NULL CHECK (role IN ('user', 'assistant', 'tool')),
+  content           TEXT,
+  reasoning_content TEXT,
+  tool_calls        JSONB,
+  tool_call_id      TEXT,
+  position          INTEGER     NOT NULL,
+  inserted_at       TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);