Add database migration scripts and configuration files

- Add verify-migration.js script for testing database migrations
- Add database config module for centralized configuration
- Add chutes.txt prompt for system responses
- Update database implementation and testing documentation
- Add database migration and setup scripts
- Update session system and LLM tool configuration
- Update deployment checklist and environment example
- Update Dockerfile and docker-compose configuration

chat/src/database/connection.js

@@ -1,7 +1,7 @@
 /**
  * Database connection module with SQLite support
  * Uses better-sqlite3 for synchronous operations
- * Note: SQLCipher support requires special compilation, using AES-256-GCM encryption at field level instead
+ * Note: SQLCipher support requires special compilation and is enabled via configuration
  */
 
 const Database = require('better-sqlite3');
@@ -11,6 +11,10 @@ const fs = require('fs');
 let db = null;
 let dbPath = null;
 
+function escapeSqliteString(value) {
+  return String(value || '').replace(/'/g, "''");
+}
+
 /**
  * Initialize database connection
  * @param {string} databasePath - Path to the database file
@@ -43,6 +47,18 @@ function initDatabase(databasePath, options = {}) {
 
   db = new Database(databasePath, dbOptions);
 
+  // SQLCipher support (optional)
+  if (options.sqlcipherKey) {
+    const escapedKey = escapeSqliteString(options.sqlcipherKey);
+    db.pragma(`key = '${escapedKey}'`);
+    if (options.cipherCompatibility) {
+      db.pragma(`cipher_compatibility = ${Number(options.cipherCompatibility)}`);
+    }
+    if (options.kdfIter) {
+      db.pragma(`kdf_iter = ${Number(options.kdfIter)}`);
+    }
+  }
+
   // Enable WAL mode for better concurrency
   if (options.walMode !== false) {
     db.pragma('journal_mode = WAL');