IB returns trading samples, not one row per wall-clock period.
Converting elapsed time to a physical prepend offset left 42,720
zero rows in NVDA's 60s buffer even though both valid margins
shared the same timestamp.
Use the actual earliest provider sample as the NativeDB boundary.
After reverse retrieval, prepend older stored rows directly beside
it.
Deats,
- start reverse insertion at the current first index;
- update `ShmArray._first` after every provider prepend;
- trim provider/NativeDB overlap by its timestamp;
- publish the final storage prepend to chart and FSP consumers;
- derive the source `time` field from `ohlc_key_map`;
- cover the full lifecycle with a real multi-frame `ShmArray`.
Prompt-IO: ai/prompt-io/opencode/20260805T195001Z_f0f3c806_prompt_io.md
(this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`))
Gud Boi