Delete row sig_4436c3cfabda from signals

id sig_4436c3cfabda
event_id evt_247ba2abe3d6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-15T00:28:16.874135+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:73d7970536aee4a0
throttle_s 0
created_at 2026-04-15T00:28:16.874135+00:00
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