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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*Purpose*: shrink megatest.db data to enable lower load and higher performance.
*Method*: add a completed-runs.db and automatically move runs data from megatest.db to that db
*Design*:
. completed-runs.db is a full megatest database with complete schema
. the data move would involve these steps
.. copy the run data to completed-runs.db
.. remove the run data, first from /tmp/…/megatest.db and /tmp/…/megatest_ref.db, followed by megatest.db
. accessing the data would be unchanged for most operations.
. a mode -full-db will be added which when specified would attach the completed-runs.db to megatest.db before doing the query
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