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diff --git a/src/purgatory/sync/mod.rs b/src/purgatory/sync/mod.rs
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+++ b/src/purgatory/sync/mod.rs
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+//! Purgatory sync module for background git data synchronization.
+//!
+//! This module implements identifier-based syncing with:
+//! - Batched OID fetching across all purgatory events for an identifier
+//! - Domain-based throttling (configurable requests/minute per domain)
+//! - Exponential backoff per identifier (20s → 2m, then 2m intervals)
+//! - Debouncing for burst event arrivals
+
+mod queue;
+
+pub use queue::SyncQueueEntry;