* Introduced QueryMode to select between stored procedure and direct SQL execution.
* Implemented dbCapability to probe for stored procedure existence.
* Added table names configuration for direct SQL operations.
* Updated DatabaseTwoFactorProvider to support query mode and table names.
* Implemented direct SQL methods mirroring stored procedures for TOTP operations.
* Added tests for query mode logic and table names validation.
* Added a database factory function to allow reconnection when the database is closed.
* Implemented mutex locks for safe concurrent access to the database connection.
* Updated all database query methods to handle reconnection attempts on closed connections.
* Enhanced error handling for database operations across multiple providers.
* Add ConfigKeyStore for in-memory key management
* Introduce DatabaseKeyStore for PostgreSQL-backed key storage
* Create KeyStoreAuthenticator for API key validation
* Define SQL procedures for key management in PostgreSQL
* Document keystore functionality and usage in KEYSTORE.md
Hein