Complete HMDS no-data replies without silently retrying a day older. Let `open_history_client()` classify the original request and leave frame stepping to `start_backfill()`. Distinguish `request_end_dt` from `oldest_shm_dt` so the first frame after an empty interval retains its unwritten end bar. Inline the storage time cutoff and drop the unused two-direction `diff_history()` helper. Explain both dates and filtering rules. Add request-boundary tests and real SHM/NativeDB regressions: all 2,004 supplied bars survive, while the closure stays empty. Prompt-IO: ai/prompt-io/codex/20260923T164656Z_efa72980_prompt_io.md (this patch was generated in some part by `codex` using `gpt-6` (`openai`)) |
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