# Filesystem as Source of Truth **Domain:** Data Architecture / Portability **Doc Type:** Canonical Concept Node **Maturity:** Core Design Principle **Related:** [[wiki/Rebuildable Projection|Rebuildable Projection]], [[wiki/Folder-Native Architecture|Folder-Native Architecture]], [[wiki/Data Serialization|Data Serialization]] --- ## Definition **Filesystem as source of truth means that canonical content, configuration, identity, and structure remain in inspectable files and directories rather than existing only inside an opaque database or service.** Indexes and databases may accelerate access, but they remain reconstructable views. ## Project Context KeyDB stored portable records in files. AutoSites mapped domains, accounts, routes, and Markdown content through directories. The larger data architecture retained folder hierarchies even when SQLite projections were considered for read speed at very large scale. ## Key Insight **The canonical record should survive the disappearance of the accelerator.** ## See Also [[projects/AutoSites - Folder-Native Publishing and Distribution|AutoSites]], [[wiki/Portability|Portability]], [[wiki/Derived Artifact|Derived Artifact]], [[wiki/Technical Terms|Technical Terms]]