Delete row sig_19488b4f672b from signals

id sig_19488b4f672b
event_id evt_7a135dd34d8a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T22:56:42.880360+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9805652db46a9077
throttle_s 0
created_at 2026-04-18T22:56:42.880360+00:00
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