alerts

Code
Manually trigger sending of scheduled alerts.
Uses current datetime to determine which alerts are ready to be sent.
This matches the behavior of the scheduled cron job.

Returns
-------
success : bool
    True if successful, False if not
messages : list of str
    List of human-readable error messages
data : dict
    Statistics about the operation:
    - sent_count: Number of alerts successfully sent
    - skipped_count: Number of alerts this run neither sent nor dead-lettered
      (no alert_email was set, a fresh re-read showed the note or its
      reference had recovered, or the guarded dead-letter update matched no
      row because the alert had since been corrected, rescheduled, retired,
      or deleted)
    - error_count: Number of alerts whose processing ended in an error (the
      send failed or had no deliverable recipient, or an exception was raised
      anywhere in the per-alert processing - lookup, dead-lettering, sending,
      or the post-send retirement)
    - dead_lettered_count: Number of alerts permanently retired without sending
      (e.g. the note's reference no longer resolves)