CloseDB closes the active database connection.

GetStorageByConfig initializes and returns the appropriate storage system based on the application configuration (e.g., database, file, or memory storage).

NewConsumer creates a new Consumer for reading from the specified file path.

NewDatabaseStore creates a new DatabaseStore instance and initializes the database connection.

NewDeletedURLError creates a new instance of DeletedURLError indicating the requested URL was deleted.

NewFileStore initializes and returns a new FileStore instance.

NewInsertConflictError creates a new instance of InsertConflictError indicating a conflict due to an already existing origin URL.

NewMemoryStore initializes and returns a new MemoryStore instance.

NewProducer creates a new Producer for writing to the specified file path.

DB represents the global database connection instance used by DatabaseStore.

Consumer is responsible for reading URL data from the file in JSON format.

DatabaseStore represents the structure for database operations.

DeletedURLError represents an error when a requested URL has been marked as deleted.

FileStore represents the file-based storage for URLs.

InsertConflictError represents an error when a conflict occurs during an INSERT operation, typically due to a unique constraint violation.

MemoryStore represents an in-memory storage for URLs.

Producer is responsible for writing URL data to the file in JSON format.

RequestBodyBanch represents the structure of a batch request for shortening multiple URLs.

RequestURL represents the structure for incoming API requests to shorten a URL.

ResponseShortURL represents the structure of the API response for a shortened URL.

Stats holds statistical information about saved URLs and users.

URL represents a mapping between a short URL and its original URL.

Storage defines the interface for a URL storage system.