Delete row sig_b2ddadaef599 from signals

id sig_b2ddadaef599
event_id evt_ece8c5096230
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T07:55:39.051616+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c318b1d2aad2669a
throttle_s 0
created_at 2026-04-18T07:55:39.051616+00:00
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