Delete row sig_b836f0d23ac0 from signals

id sig_b836f0d23ac0
event_id evt_1954fbc7df2a
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5822356 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T21:06:39Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-03T21:06:39.748579+00:00
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