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Detect users who repeatedly paste the same message within a configurable time window. On reaching the threshold (default: 3 similar messages in 120 seconds), the duplicate is deleted and the user is restricted. Key design decisions: - In-memory rolling deque per (group_id, user_id) for tracking - Text normalization + difflib similarity matching (threshold 0.97) - No UserWarning record created, so DM unrestriction flow cannot bypass (same pattern as inline keyboard spam and new user probation handlers) - Configurable per group: enabled, window_seconds, threshold, min_length Files changed: - New: handlers/duplicate_spam.py - core detection and enforcement - New: tests/test_duplicate_spam.py - 37 tests, 100% coverage - Modified: constants.py - Indonesian notification templates - Modified: group_config.py - per-group config fields + .env fallback - Modified: config.py - Settings fields for .env support - Modified: main.py - handler registration at group=0 - Modified: .env.example, groups.json.example - documentation - Modified: test_config.py, test_group_config.py - coverage for new fields
Add duplicate_spam_similarity field (float, default 0.95) to GroupConfig, Settings, and example configs. 0.95 catches minor word edits while avoiding false positives on legitimately similar messages.
…uler tests - Change default duplicate_spam_threshold from 3 to 2 (trigger on 2nd duplicate within window) - Fix RuntimeWarning in test_scheduler: mock get_chat_member to return proper MagicMock user instead of AsyncMock with unawaited coroutines
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Summary
Detects and restricts users who repeatedly paste the same message in a group chat (e.g., job spam posted 3 times in 2 minutes).
How it works
DM bypass protection
Restrictions from this handler (and existing inline keyboard spam / new user probation handlers) do NOT create a UserWarning record, so the DM unrestriction flow cannot bypass them.
Configuration (per group)
Similarity threshold reference
Test coverage