Thursday evening disaster. Client processing loan applications. System rejecting everything.
FAILURE LOGS FROM HELL
"Cannot parse table"
"Text extraction failed"
"Confidence below threshold"
"Format not recognized"
"Timeout on page 3"
500 documents. 493 failures. Success rate: 1.4%
Client "We're going back to manual. This was a mistake."
Begged for the weekend. Downloaded all 493 failed documents. Coffee. More coffee. Energy drinks. Bad decisions.
THE PATTERN IN THE CHAOS
Realized failures weren't random:
Group 1: Scanned at angle (127 docs)
Group 2: Multiple tables per page (89 docs)
Group 3: Handwritten sections (156 docs)
Group 4: Mixed orientation (74 docs)
Group 5: Low resolution scans (47 docs)
Built targeted handler for each group in n8n:
Angle detection and auto-rotation
Table boundary detection
Handwriting-specific processing
Page orientation normalization
Resolution enhancement
THE MONDAY MIRACLE
Reprocessed all 500 documents
Success: 499
Failures: 1 (coffee spill covered entire page)
Success rate: 99.8%
Client response: "How much to keep you forever?"
THE SCALING INSIGHT
These 5 failure patterns? They appear EVERYWHERE. Built them into every workflow since. Preemptive failure handling.
Current stats across all workflows:
Documents processed: 127,000+
Success rate: 98.7%
Revenue from "unprocessable" documents: $14,200/month
That weekend from hell became my competitive moat.
What document types are you assuming are "impossible"?