Fixed attachment statistics for sqlite

[Treeed]

SQLite doesn't support the backslash as an escape character by default. Any escape character must be specified by the ESCAPE function. To avoid confusion when using other DBs which do recognize the backslash, but also the ESCAPE function I used # here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.83%. Comparing base (d093721) to head (5bb79b5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #847      +/-   ##
============================================
- Coverage     60.85%   60.83%   -0.02%     
  Complexity     5931     5931              
============================================
  Files           523      523              
  Lines         20089    20089              
============================================
- Hits          12225    12222       -3     
- Misses         7864     7867       +3     

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[jbtronics]

Looks good. Thank you.