Failed to close the database connection.

Failed to establish a database connection.

Constraint violation (e.g., unique, foreign key).

Creates an in-memory SQLite connector for testing.

Database wrapper with Task/Stream semantics.

Database adapter interface for DB-agnostic operations.

Connector that produces connected DBAdapter instances.

Structured error types for database operations.

Registry of error constructors for instanceof checks.

Database transaction with Task semantics.

Transaction adapter interface.

Query execution failed.

Serialization failure (concurrent modification detected).

Transaction failed.