Create turns table

sql/init.sql

@@ -7,3 +7,4 @@ CREATE DATABASE chatrpg;
 \ir games.sql
 \ir characters.sql
 \ir sessions.sql
+\ir turns.sql

sql/turns.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS turns(
+    id UUID PRIMARY KEY,
+    session_id UUID NOT NULL REFERENCES session(id),
+    user_text TEXT NOT NULL,
+    llm_text TEXT NULL,
+    sequence_number INTEGER NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL
+);