Sentinels

[danielballan]

As discussed offline, this future-proofs MDS for the next schema change (which we all hope won't happen for a long time). Deploying it will require running

from metadatastore.utils import install_sentinels
import metadatastore.conf
install_sentinels(metadatastore.conf.connection_config, 1)

just as we did for filestore v0.4.0 deployment.

This copies the sentinels-related code from FS verbatim with only two changes:

• The list of versioned_collections has been updated in install_sentinels and self._db (which checks for sentinels)
• create_test_database returns a config with a timezone -- the local timezone from tzlocal

The MDS test utils have also been updated to use create_test_database.

[codecov-io]

Current coverage is 87.99%

Merging #232 into master will increase coverage by 1.19%

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  Files             7          8     +1   
  Lines           871        899    +28   
  Methods           0          0          
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  Branches        146        152     +6   
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+ Hits            756        791    +35   
+ Misses           85         77     -8   
- Partials         30         31     +1   

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[danielballan]

bump @tacaswell

[danielballan]

To be continued in NSLS-II databroker