Add File Metadata and Versioning System

[AnshSinghSonkhia]

Priority: High
Category: Storage & Metadata
Estimated Effort: Large

Description

Enhance the file system with metadata tracking and versioning capabilities:

• Original filename preservation
• File timestamps and size tracking
• Version history with content evolution
• File tags and descriptions

Implementation Plan

1. Metadata Structure (metadata.go)

   type FileMetadata struct {
       Hash         string    `json:"hash"`
       OriginalName string    `json:"original_name"`
       Size         int64     `json:"size"`
       CreatedAt    time.Time `json:"created_at"`
       ModifiedAt   time.Time `json:"modified_at"`
       Tags         []string  `json:"tags"`
       Description  string    `json:"description"`
       Versions     []string  `json:"versions"`
   }

2. Metadata Storage

   • SQLite database for local metadata
   • JSON files for simple deployments
   • Metadata replication across peers

3. Versioning Logic

   • Track file evolution by linking hashes
   • Implement copy-on-write semantics
   • Garbage collection for old versions

4. API Integration

   • Extend file operations to include metadata
   • Search files by name, tags, date ranges
   • Version management endpoints

Files to Create/Modify:

• metadata.go - Metadata structures and operations
• database.go - SQLite integration
• store.go - Add metadata hooks to file operations
• server.go - Metadata-aware file operations