Delete row sig_b47ce501dd76 from signals

id sig_b47ce501dd76
event_id evt_df74b4d1f791
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T03:52:55.867333+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bc30b425ff01607a
throttle_s 0
created_at 2026-04-10T03:52:55.867333+00:00
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