feat: add wechat publish recovery and conversation memory

db.mjs

@@ -232,6 +232,52 @@ export async function migrateSchema(pool) {
     ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
   `);
 
+  // Per-user conversation memory: raw dialogue rows plus lightweight extracted
+  // memory items. This is intentionally additive and can be disabled by env.
+  await pool.query(`
+    CREATE TABLE IF NOT EXISTS h5_conversation_messages (
+      id CHAR(64) PRIMARY KEY,
+      user_id CHAR(36) NOT NULL,
+      agent_session_id VARCHAR(128) NOT NULL,
+      message_key VARCHAR(128) NOT NULL,
+      sequence_no INT NOT NULL DEFAULT 0,
+      role VARCHAR(32) NOT NULL,
+      text MEDIUMTEXT NOT NULL,
+      raw_json LONGTEXT NULL,
+      analyzed_at BIGINT NULL,
+      created_at BIGINT NOT NULL,
+      updated_at BIGINT NOT NULL,
+      UNIQUE KEY uq_h5_conversation_message (agent_session_id, message_key),
+      KEY idx_h5_conversation_user_created (user_id, created_at),
+      KEY idx_h5_conversation_user_analyzed (user_id, analyzed_at),
+      CONSTRAINT fk_h5_conversation_user FOREIGN KEY (user_id) REFERENCES h5_users(id) ON DELETE CASCADE,
+      CONSTRAINT fk_h5_conversation_session FOREIGN KEY (agent_session_id) REFERENCES h5_user_sessions(agent_session_id) ON DELETE CASCADE
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
+  `);
+
+  await pool.query(`
+    CREATE TABLE IF NOT EXISTS h5_user_memory_items (
+      id CHAR(64) PRIMARY KEY,
+      user_id CHAR(36) NOT NULL,
+      label ENUM('preference', 'habit', 'interest', 'goal', 'fact', 'experience', 'knowledge') NOT NULL DEFAULT 'fact',
+      memory_hash CHAR(64) NOT NULL,
+      memory_text TEXT NOT NULL,
+      evidence_message_id CHAR(64) NULL,
+      source_session_id VARCHAR(128) NULL,
+      confidence DECIMAL(4,3) NOT NULL DEFAULT 0.600,
+      status ENUM('active', 'archived', 'deleted') NOT NULL DEFAULT 'active',
+      raw_json JSON NULL,
+      created_at BIGINT NOT NULL,
+      updated_at BIGINT NOT NULL,
+      UNIQUE KEY uq_h5_user_memory_hash (user_id, memory_hash),
+      KEY idx_h5_user_memory_user_label (user_id, label, updated_at),
+      KEY idx_h5_user_memory_session (source_session_id),
+      CONSTRAINT fk_h5_user_memory_user FOREIGN KEY (user_id) REFERENCES h5_users(id) ON DELETE CASCADE,
+      CONSTRAINT fk_h5_user_memory_evidence FOREIGN KEY (evidence_message_id) REFERENCES h5_conversation_messages(id) ON DELETE SET NULL,
+      CONSTRAINT fk_h5_user_memory_session FOREIGN KEY (source_session_id) REFERENCES h5_user_sessions(agent_session_id) ON DELETE SET NULL
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
+  `);
+
   const publishColumns = [
     ['user_confirmed_at', 'BIGINT NULL AFTER expires_at'],
     ['plaza_view_count', 'BIGINT NOT NULL DEFAULT 0'],