Delete row sig_19b12de97f3d from signals

id sig_19b12de97f3d
event_id evt_d4684ec83564
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":513,"confidence":0.8242734 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:29:12Z ...
dedupe_key ta:technical_indicator_signal:bigMoveUp:big_move:M ...
throttle_s 0
created_at 2026-04-17T20:29:12.149043+00:00
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