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d02e7e0f02
Implements issue #335: improve detection of deleted/missing posts ## Changes ### New Deletion Detection System - Created `deletion_detection.py` utility module with platform-specific indicators for Twitter, Facebook, Instagram, TikTok, YouTube, Reddit, VK, and Telegram - Detects deletion via HTML content, page titles, error messages, and video metadata - Stores detailed deletion context (indicator, source, platform) in metadata for investigators ### Integration Points - **Antibot Extractor**: Checks HTML and page titles after page load; resolves TODO about detecting deleted videos - **Generic Extractor**: Checks yt-dlp video data and error messages for deletion indicators - **Twitter Dropin**: Enhanced detection when user/created_at fields are missing ### Test Coverage - Comprehensive test suite covering all platforms - Tests for HTML, title, error message, and metadata detection - Validates that normal content is not falsely flagged ## Impact for Conflict Documentation This fix is critical for evidence preservation in war-torn regions: - Investigators can now document that evidence existed but was deleted - Prevents wasted archival attempts on deleted content - Tracks patterns of content removal - Preserves metadata about what was deleted and when Twitter example: Detects "Hmm...this page doesn't exist. Try searching for something else" and flags content as deleted_or_unavailable.