Production OCR pipeline built specifically for Tunisian invoices. Uses two AI models in sequence: a vision model to extract fiscal fields from invoice images, then a corrector model (Mistral Devstral) that validates the arithmetic and flags uncertain fields for human review. Handles Tunisia's full tax structure: 4 TVA rates (0%, 7%, 13%, 19%), timbre fiscal, and retenue à la source. Features a clean review UI with green/red confidence indicators, PostgreSQL persistence, PDF support, and automatic finetuning data collection.