Delete row sig_296eef01fcb8 from signals

id sig_296eef01fcb8
event_id evt_74cf596d46f3
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T09:04:43.825818+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:59142f66969e5727
throttle_s 0
created_at 2026-04-20T09:04:43.825818+00:00
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