Delete row sig_7ef9616c6329 from signals

id sig_7ef9616c6329
event_id evt_689b4df858c1
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T21:31:52.033476+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5abf2359da9e012f
throttle_s 0
created_at 2026-04-17T21:31:52.033476+00:00
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