[webpages] Add historical extract stashing

PROJECT.org

@@ -88,7 +88,7 @@ fetching and simple saving.
 *** Metadata sources
 **** Scraper
 
-* Backlog [1/21] :vrobbler:project:personal:
+* Backlog [2/22] :vrobbler:project:personal:
 ** TODO [#C] Create small utility to clean up tracks scrobbled with wonky playback times :bug:music:scrobbles:
 :PROPERTIES:
 :ID:       702462cf-d54b-48c6-8a7c-78b8de751deb
@@ -594,6 +594,26 @@ named constants for maintainability.
   - ~vrobbler/apps/webpages/models.py~ (line 290) -- ="url"=
   - ~vrobbler/apps/scrobbles/importers/tsv.py~ (line 55) -- ="S"= completion status
 
+** DONE [#B] Webpage scrobbles should diff existing webpages content :webpages:metadata:
+:PROPERTIES:
+:ID:       25576197-258f-48d6-bfe9-e4172a0a1898
+:END:
+
+*** Description
+
+Webpages change content between scrobbles. The current model stores the webpage content once, the
+first time it's scrobbled. When a page has been seen before, we should move the existing content
+to a new model HistoricalWebPage with the following fields:
+
+webpage_id -> FK to WebPage
+date -> date from existing WebPage content
+domain -> same as existing WebPage content
+extract -> copy of existing WebPage content
+
+Once the HistoricalWebPage instance is successfully created, the new extract data
+should be saved into the WebPage instance.
+
+
 ** DONE [#B] Make ArchiveBox push asynchronous :archivebox:async:
 :PROPERTIES:
 :ID:       17c116a7-5952-db37-e56c-2987c2fc456b