feat: set microsecond precision for gorm session service

[dpasiukevich]

Fixes #408

[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the GORM session service by standardizing timestamp precision to microseconds across all relevant database models and application logic. This change ensures data consistency, prevents potential rounding errors during storage, and aligns timestamp comparisons with the expected microsecond-level precision, ultimately resolving issues related to time discrepancies in session management.

Highlights

• Standardized Timestamp Precision: Enforced microsecond precision for all time.Time fields in GORM models (storageSession, storageEvent, storageAppState, storageUserState) by adding gorm:"precision:6" tags, ensuring consistent database storage.
• Timestamp Truncation: Explicitly truncates event.Timestamp to microsecond precision before persistence, preventing rounding errors and aligning with the database's expected precision.
• Stale Session Check Alignment: Updated the stale session detection logic to use UnixMicro() instead of UnixNano() for timestamp comparisons, aligning it with the new microsecond precision standard and matching existing Python code behavior.

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[gemini-code-assist]

Code Review

This pull request correctly implements microsecond precision for timestamps in the GORM session service. The changes involve updating GORM model struct tags to precision:6 and adjusting the application logic to handle timestamps at microsecond precision, which prevents potential rounding errors and aligns with database capabilities. The review identified a minor issue in the error logging for stale sessions, where timestamps would be formatted incorrectly. A code suggestion is provided to fix this. Overall, the changes are well-implemented and address the intended goal.