Add dataset README with schema and row examples

README.md

@@ -0,0 +1,91 @@
+---
+pretty_name: pr0gramm user comments (sanitized, vacuumed)
+license: other
+language:
+- de
+- en
+task_categories:
+- other
+---
+
+# pr0gramm-usercomments
+
+This dataset contains a sanitized SQLite export of pr0gramm item metadata and comments.
+
+Main file:
+
+- `pr0gramm-copy-vacuumed.sqlite3`
+
+Sanitization applied:
+
+- Removed crawler-specific timing fields (`comments.crawl_time`, `items.crawl_time`, `items.detail_crawl_time`)
+- Removed crawler state/failure tables (`crawl_state`, `item_detail_failures`)
+
+## Tables
+
+The database contains:
+
+- `comments`
+- `items`
+
+### comments schema
+
+- `comment_id` INTEGER PRIMARY KEY
+- `item_id` INTEGER NOT NULL
+- `parent_comment_id` INTEGER
+- `comment_time` INTEGER
+- `score` INTEGER
+- `upvotes` INTEGER
+- `downvotes` INTEGER
+- `user_name` TEXT
+- `user_id` INTEGER
+- `user_profile_url` TEXT
+- `body` TEXT
+- `raw_json` TEXT NOT NULL
+
+### items schema
+
+- `item_id` INTEGER PRIMARY KEY
+- `promoted` INTEGER
+- `flags` INTEGER
+- `created_at` INTEGER
+- `user_name` TEXT
+- `source_feed` TEXT NOT NULL
+- `raw_json` TEXT NOT NULL
+
+## Example rows
+
+Example row from `comments`:
+
+```sql
+comment_id: 83842203
+item_id: 480055
+parent_comment_id: 0
+comment_time: 1776609541
+score: 1
+upvotes: 1
+downvotes: 0
+user_name: "1111111101"
+user_id: NULL
+user_profile_url: "https://pr0gramm.com/user/1111111101"
+body: "Damals war OC noch gut"
+raw_json (truncated): {"id":83842203,"parent":0,"content":"Damals war OC noch gut","created":1776609541,"up":1,"down":0,"confidence":0.206543,"name":"1111111101","mark":10}
+```
+
+Example row from `items`:
+
+```sql
+item_id: 6986879
+promoted: 0
+flags: 1
+created_at: 1776453456
+user_name: "Ometen"
+source_feed: "new"
+raw_json (truncated): {"id":6986879,"promoted":0,"userId":132720,"up":1,"down":0,"created":1776453456,"image":"2026/04/17/8804ec2d7b3e5297-h264-ultra_hd.mp4","thumb":"2026/04/17/8804ec2d7b3e5297.jpg",...}
+```
+
+## Notes
+
+- Timestamps are stored as Unix seconds.
+- `raw_json` contains API payload snapshots and may include fields not normalized into separate columns.
+