Delete row sig_3da614be6eef from signals

id sig_3da614be6eef
event_id evt_077ac7aca3a6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T01:12:29.768557+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ccf8f321f6b22cb7
throttle_s 0
created_at 2026-04-10T01:12:29.768557+00:00
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