TTL eviction on checkpoint completion
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type:devtask
- Dominant language
- Java
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Description
### Task Description
**What needs to be done:**
Drop CFs whose last-access exceeds partition.ttl.hours, triggered from the existing checkpoint-complete hook (onCheckpointComplete) already on IndexBackend. Details need to be clarified with the consideration of no dataloss.
**Why this task is needed:**
### Task Type
Code improvement/refactoring
### Related Issues
**Parent feature issue:** (if applicable )
**Related issues:**
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