Add functions to work with the local file database

[Alex-Telt]

1. Full text search by file content

1.1. Install the Full Text Search module in SQLite

1.2. Add the content TEXT field to the table to save the content

1.3. When indexing - read the contents of files and save them to this field

1.4. Search also by this text field

2. Automatically update the file database

write a script that will periodically scan the specified directories on the file server, find new files and add them to the database.

3. User-friendly interface for managing the database

Implement commands in a bot or a separate web interface for viewing, searching, and updating the database of files. Possibilities to import, export, clean the database, etc.

4. Smart keyword summarization

Use machine learning models to summarize file descriptions and keywords based on their content.

5. Caching of search results

Store popular queries and files in the cache so that you don't have to read from the database when you make repeated requests. Speeds up work.