Delete row sig_ca7bc5d57650 from signals

id sig_ca7bc5d57650
event_id evt_6377f3d7f5f8
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6179909 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:05:09Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-08T20:05:09.377597+00:00
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