Describe the algorithm of the GET /tables/{id} method: how is the response filled, and where does the data for mapping come from?

The GET /tables/{id} method is typically used to retrieve information about a table by its identifier.

Workflow:

1. Retrieving the id parameter — the table identifier is extracted from the URL.

2. Database query — a query is performed to the metadata table or the table itself using the id to obtain information about the structure, data, or properties.

3. Forming the data model — the data obtained from the database is mapped to internal objects or DTOs (Data Transfer Objects), which reflect the table's structure, columns, data types, constraints, etc.

4. Forming the response — based on the model, a JSON or other response format is generated and returned to the client.

The data for mapping is taken from:

• system tables of the database (e.g., information_schema or pg_catalog in PostgreSQL), if metadata needs to be retrieved;
• user tables, if the method returns the table content;
• cache or business logic layer, if the data is pre-processed.

Thus, the response contains structured information about the table, allowing the client to understand its structure and content.