Delete row sig_d21250ca34e0 from signals

id sig_d21250ca34e0
event_id evt_1bbbeac5c277
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T11:13:45.957888+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:269dae1319c3a4d3
throttle_s 0
created_at 2026-04-22T11:13:45.957888+00:00
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