37 строки
2.0 KiB
Markdown
37 строки
2.0 KiB
Markdown
The metadata database in Activity Stream stores information about pages and their images in the following tables.
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# Metadata Table
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A row in this table represents the metadata of a single page which has been visited 1 or more times by the user.
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field | type | description
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--- | --- | ---
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id | Int | auto incrementing primary key
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cache_key | String (Unique) | A simplified URL which is shared across multiple places URLs (ie protocol removed, query string reduced/removed)
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places_url | String | The unmodified URL which appears in the PlacesDB when a user visits a page
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title | String | The title of the page
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type | String | The og:type tag ie 'article', 'video', 'page', etc
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description | String | The meta description of the page
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media_url | String | The URL for an embedded media item (audio/video)
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created_at | datetime | The date and time that this metadata row was inserted/created
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expired_at | Long | The date and time this metadata row will expire
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# Images Table
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A row in this table represents a single image which appears on a page visited by a user, including favicons and rich icons. Each row in the metadata table will have multiple corresponding images in this table. A single row in this table may belong to multiple metadata page rows, ie a favicon which is identical for multiple pages.
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field | type | description
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--- | --- | ---
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id | Int | auto incrementing primary key
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type | Int | The type of the image, initial types are: favicon 1, rich_icon 2, preview 3 (constants)
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url | String | The URL for the image
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height | Int | The height of the image in pixels
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width | Int | The width of the image in pixels
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color | String | The dominant/aggregate color of the image
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# MetadataImage Join Table
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A row in this table represents a pair of a metadata row and an image row which indicates that that image appears on that page.
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field | type | description
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--- | --- | ---
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metadata_id | Int | A foreign key onto the Metadata table
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image_id | Int | A foreign key onto the Images table
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