Delete row sig_e191e0cc5017 from signals

id sig_e191e0cc5017
event_id evt_3e5430c0d7d8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T15:24:35.557162+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:93f376c43db7cc74
throttle_s 0
created_at 2026-04-19T15:24:35.557162+00:00
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