Delete row sig_a77056cf062c from signals

id sig_a77056cf062c
event_id evt_df5ee887e7f9
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5586026 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:12:52Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-09T20:12:52.443501+00:00
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