Delete row sig_da49dc5924ec from signals

id sig_da49dc5924ec
event_id evt_4d97d8dd8f80
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7180425 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:11:54Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-20T20:11:54.360053+00:00
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