Big-Link-Man/docs/prd/non-functional-requirements.md

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# Non-Functional Requirements
## NFR1: Python Development
The application and all scripts must be developed in Python.
## NFR2: SQLite Database
The initial database must be SQLite.
## NFR3: Database-Agnostic Architecture
The data access layer must be architected (e.g., using the Repository Pattern) to be database-agnostic, simplifying a future migration to a more scalable database like PostgreSQL.
## NFR4: Environment Variables
All secrets, credentials, and API keys must be stored in and accessed from a .env file, not hardcoded.
## NFR5: Command-Line Interface
The MVP will be a set of command-line tools; a web-based user interface is explicitly out of scope.
## NFR6: Backup Protection
The interlinking script must create backups of any existing HTML files before modifying them to prevent data loss.
## NFR7: Cloud Integration Libraries
Cloud integrations will use specific libraries: Boto3 for AWS S3 and the Azure SDK for Blob Storage.