Delete row sig_439c545cbf4e from signals

id sig_439c545cbf4e
event_id evt_8ef920c4b2a1
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T23:57:13.488985+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e573f33b678c60b3
throttle_s 0
created_at 2026-04-19T23:57:13.488985+00:00
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