Delete row sig_f03caee9aa02 from signals

id sig_f03caee9aa02
event_id evt_56c9e0fd8396
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T03:51:14.645073+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:192ac61e38382a7a
throttle_s 0
created_at 2026-04-21T03:51:14.645073+00:00
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