SQL Agent with Memory for API File Processing

### LangChain SQL Agent can make several queries before producing the final answer.
Try these examples:
1. "Please describe the database". This input usually requires just 1 query + an extra observation to produce a final answer.
2. "What are the revenues by genre?". This input will launch a series of Agent actions, because it needs to make several queries.

The final answer is stored in the memory and will be recalled on the next input from the user.