Today I had a power outage, from the 06:01 CEST to the 07:51 CEST.
So the last record added by weewx before the outage was at 06:01 CEST. From
logs (reporting here only last two lines):
pi@raspberrypi:~ $ journalctl -b -1
Aug 20 06:01:14 raspberrypi python3[16243]: weewx[16243] INFO
weewx.manager: Added record 2022-08-20 06:01:00 CEST (1660968060) to
database 'weewx.sdb'
Aug 20 06:01:14 raspberrypi python3[16243]: weewx[16243] INFO
weewx.manager: Added record 2022-08-20 06:01:00 CEST (1660968060) to daily
summary in 'weewx.s>
When the power came back, the wifi was not available, so the raspberry's
time (I have no RTC module) was automatically set to a previously recorded
timestamp: 05:53:32 CEST (118 mins before real time).
So when weewx re-started recording, it discarded first 8 samples and then
started going. From logs:
Aug 20 06:01:19 raspberrypi python3[600]: weewx[600] ERROR
weewx.manager: Unable to add record 2022-08-20 05:54:00 CEST (1660967640)
to database 'weewx.sdb': UNIQUE constraint failed: archive.dateTime
Aug 20 06:01:19 raspberrypi python3[600]: weewx[600] ERROR
weewx.manager: Unable to add record 2022-08-20 05:55:00 CEST (1660967700)
to database 'weewx.sdb': UNIQUE constraint failed: archive.dateTime
Aug 20 06:01:19 raspberrypi python3[600]: weewx[600] ERROR
weewx.manager: Unable to add record 2022-08-20 05:56:00 CEST (1660967760)
to database 'weewx.sdb': UNIQUE constraint failed: archive.dateTime
Aug 20 06:01:19 raspberrypi python3[600]: weewx[600] ERROR
weewx.manager: Unable to add record 2022-08-20 05:57:00 CEST (1660967820)
to database 'weewx.sdb': UNIQUE constraint failed: archive.dateTime
Aug 20 06:01:19 raspberrypi python3[600]: weewx[600] ERROR
weewx.manager: Unable to add record 2022-08-20 05:58:00 CEST (1660967880)
to database 'weewx.sdb': UNIQUE constraint failed: archive.dateTime
Aug 20 06:01:19 raspberrypi python3[600]: weewx[600] ERROR
weewx.manager: Unable to add record 2022-08-20 05:59:00 CEST (1660967940)
to database 'weewx.sdb': UNIQUE constraint failed: archive.dateTime
Aug 20 06:01:19 raspberrypi python3[600]: weewx[600] ERROR
weewx.manager: Unable to add record 2022-08-20 06:00:00 CEST (1660968000)
to database 'weewx.sdb': UNIQUE constraint failed: archive.dateTime
Aug 20 06:01:19 raspberrypi python3[600]: weewx[600] ERROR
weewx.manager: Unable to add record 2022-08-20 06:01:00 CEST (1660968060)
to database 'weewx.sdb': UNIQUE constraint failed: archive.dateTime
Aug 20 06:02:16 raspberrypi python3[600]: weewx[600] INFO
weewx.manager: Added record 2022-08-20 06:02:00 CEST (1660968120) to
database 'weewx.sdb'
Aug 20 06:02:16 raspberrypi python3[600]: weewx[600] INFO
weewx.manager: Added record 2022-08-20 06:02:00 CEST (1660968120) to daily
summary in 'weewx.sdb'
But, and this is a bit surprising, it also discarded records collected in
the davis datalogger.
They are 110 lines, from 1660968120 (06:02:00 CEST) and 1660974660
(07:51:00 CEST) (The power outage didn't affect the davis station: it is
battery powered).
>From logs (reporting only the first and the last one):
Aug 20 05:53:35 raspberrypi python3[600]: weewx[600] WARNING
weewx.engine: Ignore historical record: {'dateTime': 1660968120, 'usUnits':
1, 'interval': 1, 'rxCheckPercent': 89.6875, 'outTemp': 68.8>
...
Aug 20 05:53:35 raspberrypi python3[600]: weewx[600] WARNING
weewx.engine: Ignore historical record: {'dateTime': 1660974660, 'usUnits':
1, 'interval': 1, 'rxCheckPercent': 100.0, 'outTemp': 69.5, >
Why were they discarded? Because the weewx time was before the record's
time?
Then, few hours later I restored the wifi network, and the rasp
automatically changed his time, and so weewx. From logs:
Aug 20 12:09:33 raspberrypi systemd[1]: Started Network Time
Synchronization.
Aug 20 14:07:04 raspberrypi systemd-timesyncd[2057]: Initial
synchronization to time server 93.94.88.51:123 (0.debian.pool.ntp.org).
Aug 20 14:07:05 raspberrypi python3[600]: weewx[600] INFO weewx.engine:
Clock error is -7050.52 seconds (positive is fast)
Aug 20 14:07:05 raspberrypi python3[600]: weewx[600] INFO
weewx.drivers.vantage: Clock set to 2022-08-20 14:07:06 CEST (1660997226)
After this, it started to store data correctly, starting from 1660997280
(14:08:00 CEST).
Now the situation is:
- I have a hole from the 1660990140 (12:09:00 CEST) to 1660997280 (14:08:00
CEST) (excluded). (When I restored the network connection, and rasp fixed
its time).
- All the database records with dateTime from 1660968120 (06:02:00 CEST) to
1660990140 (12:09:00 CEST) (included) are backshifted of 118 minutes
- Real records from 1660968120 (06:02:00 CEST) to 1660974660 (07:51:00
CEST) are in the datalogger so I can restore them.
- The only records I lost, are the first 8 samples weewx took after restart
(from 07:52:00 CEST to 07:59:00 CEST, included)
My plan to fix data:
1. drop (but preserving for later use) all the records starting from
1660968120 (06:02:00 CEST) (included) from the `archive` table in the
database
2. start weewx with datalogger activated to download records from
1660968120 (06:02:00 CEST) to 1660974660 (07:51:00 CEST)
3. re-insert records I removed at step 1. insert only from 1660968120
(06:02:00 CEST) to 1660990140 (12:09:00 CEST), adding 118*60 to dateTime
4. re-insert all the following records (so starting from 1660997280
(14:08:00 CEST)) keeping them as they are
5. fix other table running `wee_database --drop-daily` and then
`wee_database --rebuild-daily` (maybe scoped to the single day of today)
Any suggestion, or comment?
Thanks
[But at the end, I have a question: Why in the datalogger, records starting
from 07:52:00 CEST, have the same wrong values present in the weewx
database? Is the datalogger written by weewx?
I mean: It looks like the datalogger has been written by weewx when (i) no
data were present AND (ii) weewx was connected to him (so, starting from
07:52:00 CEST. before data are present, collected by the station itself)]
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