chore: add domain/deposit agent session tables migration

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

migrations/006_add_agent_sessions.sql

@@ -0,0 +1,32 @@
+-- Migration 006: Add domain and deposit agent session tables
+-- Date: 2026-02-05
+-- Description: Add domain_sessions and deposit_sessions tables for multi-turn agent conversations
+
+-- Domain agent sessions table
+CREATE TABLE IF NOT EXISTS domain_sessions (
+  user_id TEXT PRIMARY KEY,
+  status TEXT NOT NULL CHECK(status IN ('gathering', 'suggesting', 'confirming', 'setting_ns', 'completed')),
+  collected_info TEXT,
+  target_domain TEXT,
+  messages TEXT,
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL,
+  expires_at INTEGER NOT NULL
+);
+
+-- Deposit agent sessions table
+CREATE TABLE IF NOT EXISTS deposit_sessions (
+  user_id TEXT PRIMARY KEY,
+  status TEXT NOT NULL CHECK(status IN ('collecting_amount', 'collecting_name', 'confirming', 'completed')),
+  collected_info TEXT,
+  messages TEXT,
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL,
+  expires_at INTEGER NOT NULL
+);
+
+-- Create index for expiry cleanup (domain_sessions)
+CREATE INDEX IF NOT EXISTS idx_domain_sessions_expires ON domain_sessions(expires_at);
+
+-- Create index for expiry cleanup (deposit_sessions)
+CREATE INDEX IF NOT EXISTS idx_deposit_sessions_expires ON deposit_sessions(expires_at);