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← All patterns

securityhigh impacttier 1100% confidence

Concurrent order creations with same coupon code — race condition on used_count

from coupons agent · cross-site verified across production deployments

The trigger

The fix

Use SECURITY DEFINER plpgsql function with FOR UPDATE lock to atomically validate+increment

Code example

SELECT ... FROM coupons WHERE code=? FOR UPDATE; if constraints pass: UPDATE coupons SET used_count=used_count+1

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spf_dkim_dmarc_setup

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bounce_3_layer

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