Chunk 9.0

Here is a summary of this chunk: This session completed the implementation of Milestone 03 (Persistent Retrieval Caches) and Milestone 04 (Data Lifecycle Management), committing them as separate milestones. For Milestone 03, the L2 SSD Cache (SLRU eviction, admission policy, write buffering, and persistence), the Access Tracker (decaying popularity counters and sequential pattern detection), and the DAG-aware Prefetch Engine were created and tested. These components were then integrated into the `retr_provider.go`, replacing the basic LRU cache with a multi-tier L1/L2 cache hierarchy and adding configuration options for all new features. For Milestone 04, a passive garbage collection (GC) system was built, including CQL and SQL schema migrations for reverse indices and GC state tracking, a reference counter for tracking live block references, and the GC algorithm itself. The claim extender was modified to skip groups marked as GC candidates, and configuration options for GC and repair workers were added to the configuration file.

From Cache Algorithms to Log Shipping: The Complete Arc of a Distributed Systems Milestone Sprint 2187 words

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