fix: add pagination to auto_close_service run() to prevent memory exhaustion (#1524)

[duongynhi000005-oss]

Summary

Fixes #1524

The run() method in backend/services/auto_close_service.py previously fetched ALL resolved tickets in a single unbounded query with no .limit() or pagination. As ticket count grows, this loads every resolved ticket from every company into memory at once on every cron run, causing memory exhaustion and timeouts.

Changes

• Added paginated fetching using .range() with a PAGE_SIZE of 1000
• Loop continues until all pages are consumed (when len(page) < PAGE_SIZE)
• Each page fetch is logged for observability
• Maintains backward compatibility with existing behavior

Testing

• Existing tests continue to pass (pagination transparent to callers)
• The test_query() debug method already uses .limit(10), showing awareness of this concern — this fix applies the same principle to the production run() method.

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[ritesh-1918]

Hi @duongynhi000005-oss! 🙌

Thank you so much for your excellent contribution: "fix: add pagination to auto_close_service run() to prevent memory exhaustion (#1524)"! We really appreciate the high-quality code and effort you have put into the platform.

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[ritesh-1918]

Merged locally into gssoc branch. Thank you for your GSSoC contribution! 🚀🔥