Delete row sig_072bf9f48d88 from signals

id sig_072bf9f48d88
event_id evt_506d453e519a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T22:21:21.499061+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5f416041565446a6
throttle_s 0
created_at 2026-04-19T22:21:21.499061+00:00
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