Delete row sig_3b3606ff8a9e from signals

id sig_3b3606ff8a9e
event_id evt_3b757ed7860b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T02:06:24.378808+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b6e0185fbd7b4c27
throttle_s 0
created_at 2026-04-20T02:06:24.378808+00:00
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