Add RedReader support for Android

[abrignoni]

Adds RedReader (org.quantumbadger.redreader) support for Android, an open source Reddit client that works without an account. Three artifacts:

• Fetch History (cache.db): the index of the app's HTTP cache, one row per request with URL, account and time. File type is decoded from the app's FileType constants (Constants.java lines 263-275 at tag v1.26). The type decides how much weight a row carries: a Subreddit about row plus a Post list row together date a visit to that subreddit, and on the tested device the two subreddits opened produced exactly those. A Comment list row is weaker, because the app precaches comment threads for the posts it lists (the same file defines a COMMENT_PRECACHE priority at line 256): the tested device opened two threads and holds seventy comment rows. The notes say all of this, and that a cache prunes, so an absence is not evidence a request was never made.
• Subreddits Opened: the per-account subreddit database. Its file name is the SHA-1 of the username (RedditSubredditManager.java line 100), so the anonymous account's file begins DA39A3EE…, the SHA-1 of an empty string, and a signed-in account's begins with the SHA-1 of its name. The Account Hash column carries that prefix so an examiner can test a suspected username against the file. One row per subreddit opened, with the time it was cached; the multi-kilobyte sidebar markdown Reddit stores per subreddit is not reported.
• Accounts and Subscriptions: the account list without its OAuth refresh token (a credential, deliberately omitted), and the subscription list, which for the anonymous account is the app's shipped default set rather than anyone's choices.

Verified on a multi-container tree: the storage spellings collapse, a second Android user adds its own rows against a known delta (88 then 128 cache rows with a tenant holding 40), and a decoy package adds none. sample_data follows with the next corpus capture.

🤖 Generated with Claude Code