Delete row sig_28429e0bd337 from signals

id sig_28429e0bd337
event_id evt_900995cdf3bf
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.8053847 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:38:03Z ...
dedupe_key ta:technical_indicator_signal:bigMoveUp:big_move:S ...
throttle_s 0
created_at 2026-04-21T20:38:03.706273+00:00
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