[wangyinz]

Fixes #880.

Summary

• validate required station/network values before database access
• use the same inclusive station/time predicate for reads and updates
• make normal and no-timeout cursor paths process the same documents
• return exact integer update counts, including zero for empty results
• validate site networks and overlapping intervals before arrival writes
• close every site and arrival cursor on success and exception paths

Verification

• focused interval/cursor lifecycle contract: 30 passed
• baseline red: 20 failed, 6 passed
• meaningful adjacent preprocessing regressions: 27 passed, 1 deselected
• compound $gte/$lte behavior also checked with temporary mongomock (not represented as a real Mongo service)
• Black, py_compile, and git diff --check passed

This PR is Ready: the renewed review found no unresolved query, scientific, API, or resource-lifecycle decision.

[codecov]

Codecov Report

❌ Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 72.49%. Comparing base (e505fcf) to head (41e9918).

Files with missing lines	Patch %	Lines
python/mspasspy/preprocessing/css30/dbarrival.py	97.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #913      +/-   ##
==========================================
+ Coverage   72.24%   72.49%   +0.24%     
==========================================
  Files         182      182              
  Lines       36103    36121      +18     
  Branches     2532     2532              
==========================================
+ Hits        26083    26186     +103     
+ Misses       9114     9029      -85     
  Partials      906      906              

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[wangyinz]

Review finding before merge: every cursor created by set_netcode_time_interval and set_arrival_by_time_interval must be closed in try/finally, including no_cursor_timeout=True site/arrival cursors and exception paths. Extend the cursor test double with close() and assert closure on success and raised validation, overlap, and update errors. No query semantics or scientific behavior change is requested.