Clarification required: historical 5-minute candle semantics at NSE 15:15 CAS boundary

We are validating an offline/source-only research capture, not placing orders. We use historical `interval=5minute`, NSE cash EQ instruments and the NIFTY 50/NIFTY BANK index series. Only candles labelled 14:45, 14:50, 14:55, 15:00, 15:05 and 15:10 are admitted. The first application-success response is captured after 15:15 and by 15:30 IST; later downloads are diagnostics, never replacements. No credentials or account details are needed for these questions.

1. Does timestamp `15:10:00+05:30` for a `5minute` historical candle denote exactly the half-open interval `[15:10:00,15:15:00)`? Is that timestamp the start of the event interval for cash equities and indices?
2. Is a trade/event timestamped exactly `15:15:00` excluded from that candle and assigned to the 15:15-start interval (or excluded from continuous-session candles for CAS securities)? Please distinguish boundary inclusion from whether a subsequent interval is published.
3. At what point is the 15:10 candle considered complete in the historical endpoint? Is there a completion indicator or documented delay, and can a response obtained after 15:15 still contain a partial 15:10 candle?
4. Can its OHLCV values later be revised? If so, under what circumstances, and is there any finality/revision marker or deadline? Please distinguish late trade ingestion, correction, aggregation cleanup and corporate-action back-adjustment.
5. Are historical candles assigned using exchange event time or vendor receipt/processing time? How are delayed or out-of-order events assigned, including exactly-boundary events?
6. How are corporate-action adjustments handled for intraday historical OHLCV: splits, bonuses, dividends, rights, demergers/schemes and symbol/ISIN changes? Which dates and OHLC/volume fields are changed, at what effective time, and is an explicitly unadjusted published series available? Please also confirm price/volume units, scaling and the corresponding index-series semantics. A current specification is needed because older support statements differ by date/action.
7. Since NSE CAS begins at 15:15 for eligible cash securities, can any CAS order, execution or indicative value after 15:15 affect a historical candle labelled 15:10, including through back-labelling or later aggregation/correction? Your CAS support thread describes separation from continuous-session candles; please confirm the exact boundary and exception handling.

Please identify what is guaranteed by the current service versus typical observed behavior. An inability to guarantee any item is also useful; we will retain that limitation rather than infer a guarantee.