Initial commit

sql/create_calibration_audit_table.sql

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+-- SQL to create calibration_audit table in Supabase
+CREATE TABLE IF NOT EXISTS calibration_audit (
+  id BIGSERIAL PRIMARY KEY,
+  calibration_id UUID REFERENCES calibrations(id),
+  user_id UUID REFERENCES users(id),
+  action TEXT NOT NULL,
+  old_values JSONB,
+  new_values JSONB,
+  timestamp TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  ip_address TEXT
+);
+
+CREATE INDEX IF NOT EXISTS idx_calibration_audit_calibration_id ON calibration_audit(calibration_id);
+CREATE INDEX IF NOT EXISTS idx_calibration_audit_user_id ON calibration_audit(user_id);
+CREATE INDEX IF NOT EXISTS idx_calibration_audit_timestamp ON calibration_audit(timestamp);