Delete row sig_76fe8703798a from signals

id sig_76fe8703798a
event_id evt_17fa8c98ccf8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T11:08:35.911969+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:97e37d6eba9c2076
throttle_s 0
created_at 2026-04-09T11:08:35.911969+00:00
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