Delete row sig_74b7e636632e from signals

id sig_74b7e636632e
event_id evt_dc225fb854cd
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T23:50:09.165355+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7d1684c60931fa02
throttle_s 0
created_at 2026-04-10T23:50:09.165355+00:00
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