Delete row sig_110400a741fb from signals

id sig_110400a741fb
event_id evt_30305efc0e41
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6272486 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-15T02:04:42Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-18T02:04:42.432504+00:00
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