add query history functionality with database integration

added explain endpoint

fixes

fix router prefix

fixed allowed table error

update in schema

feat: add connection endpoint and update schema indexing functionality

added router in main

schema feature endpoint added

changes done in prompt

fix: enhance SQL agent's system message with detailed operation guidelines

refactor: update import statement for DatabaseTools

agent version2

fixing check query

added modular code

fixing check query issue

fixing check query

rebuild

added gemini model

model changed

model changed

code push