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The best method discovered to date for re-creating the session structure within the MOUS involves collecting data from the tables: AQUA_EXECBLOCK, AQUA_SESSION, SHIFTLOG_ENTRIES, and BMMV_SCHEDBLOCK to generated a time-ordered list of EBs and their , with session number and status information.     This is the data that allows for the creation of a reasonable set of ProcessingIntents entries (including creating blank sessions in the correct locations).

Runtime Data Gathering:

In order to mitigate the the effect of changing information changes to the ALMA metadata database after it has been ingested by the AAT/PPI, the constituent components to facilitate a restore (raw data, calibration files, and session information) are all queried as part of the setup for performing the processing. 

Caveats:

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ASA_* tables are known to be of questionable reliability.  Those tables are reportedly dropped and rebuilt on an irregular basis. 

Unknown timescale, unknown changes, etc

Also intermittent failures of the processing infrastructure and occasional ingestion issues.

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