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Use fixed-size directory meta files

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Add a new schema version 5; now 4 means the directory meta may or may
not be upgraded.

Fixes #65: now it's possible to open the directory even if it lies on a
completely full disk.
This commit is contained in:
Scott Lamb
2019-07-04 23:22:45 -05:00
parent 13b192949d
commit d61b5e1bdd
11 changed files with 236 additions and 33 deletions
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guide/schema.md
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@@ -223,11 +223,18 @@ Version 3 adds over version 1:
* additional timestamp fields which may be useful in diagnosing/correcting
time jumps/inconsistencies.
### Version 3 to version 4
### Version 3 to version 4 to version 5
This upgrade affects only the SQLite database. Version 4 adds over version 3:
This upgrade affects only the SQLite database.
Version 4 represents a half-finished upgrade from version 3 to version 5; it
is never used.
Version 5 adds over version 3:
* permissions for users and sessions. Existing users will have only the
`view_video` permission, matching their previous behavior.
* the `signals` schema, used to store status of signals such as camera
motion detection, security system zones, etc.
* the ability to recover from a completely full sample file directory (#65)
without manual intervention.