Add an option to schedule database cleanup.

[luuquangvu]

• Fixes the MDB_MAP_FULL error.
• The retention_days parameter defaults to 14 days and setting it to 0 disables cleanup.
• Increase the default max_size to 256 MB.

Update:

• Fixes LLM returned no images for the requested image_generation tool. The root cause is an issue with cookies expiring.
• Fixes some unhandle exceptions.

[Copilot]

Pull Request Overview

This PR implements automatic cleanup of expired conversations in the LMDB storage based on a configurable retention period. The retention policy helps manage storage space by removing old conversations after a specified number of days.

• Adds a retention_days configuration parameter with a default of 14 days
• Implements a cleanup_expired() method in LMDBConversationStore to delete old conversations
• Introduces a background task that runs every 6 hours to enforce the retention policy

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
config/config.yaml	Increased max database size to 256 MB and added retention_days: 14 configuration
app/utils/config.py	Added retention_days field to StorageConfig model with default value of 14 days
app/services/lmdb.py	Added retention_days parameter to constructor and implemented cleanup_expired() method
app/main.py	Added background task _run_retention_cleanup() that periodically calls cleanup with 6-hour intervals

Comments suppressed due to low confidence (1)

app/services/lmdb.py:53

• The docstring mentions default of 128MB but the code has been updated to use 256MB. Update the documentation to reflect the new default value of 256MB.

            max_db_size: Maximum database size in bytes (default: 128MB)

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[Copilot]

Pull Request Overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

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