Delete row sig_a4169b3d8bac from signals

id sig_a4169b3d8bac
event_id evt_ae87d2821413
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T11:16:19.235880+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b4c10eca22d6a123
throttle_s 0
created_at 2026-04-12T11:16:19.235880+00:00
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