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Fix typo and add link to API

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This commit is contained in:
Fabian Affolter 2016-02-07 09:49:56 +01:00
parent 967dea3b5a
commit d2a66e6987
1 changed files with 14 additions and 10 deletions
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source/_components/history.markdown
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@ -28,22 +28,22 @@ history:
</p>
<p class='note'>
Events are saved in a local database. Google Graphs is used to draw the graph. Drawing is happening 100% in your browser - no data is transferred to anyone at any time.
Events are saved in a local database. Google Graphs is used to draw the graph. Drawing is happening 100% in your browser. No data is transferred to anyone at any time.
</p>
#### {% linkable_title Implementation details %}
The history is stored in a SQLite databse `home-assistant.db` within your config directory.
The history is stored in a SQLite database `home-assistant.db` within your config directory.
- events table is all events except time_changed that happened while recorder component was running.
- states table contains all the new_state values of state_changed events.
- events table is all events except `time_changed` that happened while recorder component was running.
- states table contains all the `new_state` values of `state_changed` events.
- Inside the states table you have:
- entity_id: the entity_id of the entity
- state: the state of the entity
- attributes: JSON of the state attributes
- last_changed: timestamp last time the state has changed. A state_changed event can happen when just attributes change.
- last_updated: timestamp anything has changed (state, attributes)
- created: timestamp this entry was inserted into the database
- `entity_id`: the entity_id of the entity
- `state`: the state of the entity
- `attributes`: JSON of the state attributes
- `last_changed`: timestamp last time the state has changed. A state_changed event can happen when just attributes change.
- `last_updated`: timestamp anything has changed (state, attributes)
- `created`: timestamp this entry was inserted into the database
When the history component queries the states table it only selects states where the state has changed: `WHERE last_changed=last_updated`
@ -55,3 +55,7 @@ SQLite databases do not support native dates. That's why all the dates are saved
from datetime import datetime
datetime.fromtimestamp(1422830502)
```
#### {% linkable_title API %}
The history information are also available through the [RESTful API](/developers/rest_api/#get-apihistory).