Delete row sig_74f0e079c78b from signals

id sig_74f0e079c78b
event_id evt_ec6c854b02a0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T07:26:52.382845+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f640e2381b42d20d
throttle_s 0
created_at 2026-04-22T07:26:52.382845+00:00
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