Major refactoring: Updated manifest format and renamed backup to snapshot

- Created manifest.go with proper Manifest structure including blob sizes
- Updated manifest generation to include compressed size for each blob
- Added TotalCompressedSize field to manifest for quick access
- Renamed backup package to snapshot for clarity
- Updated snapshot list to show all remote snapshots
- Remote snapshots not in local DB fetch manifest to get size
- Local snapshots not in remote are automatically deleted
- Removed backwards compatibility code (pre-1.0, no users)
- Fixed prune command to use new manifest format
- Updated all imports and references from backup to snapshot

internal/cli/prune.go

@@ -2,18 +2,16 @@ package cli
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"strings"
 
-	"git.eeqj.de/sneak/vaultik/internal/backup"
 	"git.eeqj.de/sneak/vaultik/internal/config"
 	"git.eeqj.de/sneak/vaultik/internal/database"
 	"git.eeqj.de/sneak/vaultik/internal/globals"
 	"git.eeqj.de/sneak/vaultik/internal/log"
 	"git.eeqj.de/sneak/vaultik/internal/s3"
+	"git.eeqj.de/sneak/vaultik/internal/snapshot"
 	"github.com/dustin/go-humanize"
-	"github.com/klauspost/compress/zstd"
 	"github.com/spf13/cobra"
 	"go.uber.org/fx"
 )
@@ -66,7 +64,7 @@ specifying a path using --config or by setting VAULTIK_CONFIG to a path.`,
 					Debug:   rootFlags.Debug,
 				},
 				Modules: []fx.Option{
-					backup.Module,
+					snapshot.Module,
 					s3.Module,
 					fx.Provide(fx.Annotate(
 						func(g *globals.Globals, cfg *config.Config, repos *database.Repositories,
@@ -195,8 +193,8 @@ func (app *PruneApp) runPrune(ctx context.Context, opts *PruneOptions) error {
 
 	// Step 5: Build set of referenced blobs
 	referencedBlobs := make(map[string]bool)
-	for _, blobHash := range manifest.Blobs {
-		referencedBlobs[blobHash] = true
+	for _, blob := range manifest.Blobs {
+		referencedBlobs[blob.Hash] = true
 	}
 
 	// Step 6: List all blobs in S3
@@ -277,16 +275,8 @@ func (app *PruneApp) runPrune(ctx context.Context, opts *PruneOptions) error {
 	return nil
 }
 
-// BlobManifest represents the structure of a snapshot's blob manifest
-type BlobManifest struct {
-	SnapshotID string   `json:"snapshot_id"`
-	Timestamp  string   `json:"timestamp"`
-	BlobCount  int      `json:"blob_count"`
-	Blobs      []string `json:"blobs"`
-}
-
 // downloadManifest downloads and decompresses a snapshot manifest
-func (app *PruneApp) downloadManifest(ctx context.Context, snapshotID string) (*BlobManifest, error) {
+func (app *PruneApp) downloadManifest(ctx context.Context, snapshotID string) (*snapshot.Manifest, error) {
 	manifestPath := fmt.Sprintf("metadata/%s/manifest.json.zst", snapshotID)
 
 	// Download the compressed manifest
@@ -296,18 +286,11 @@ func (app *PruneApp) downloadManifest(ctx context.Context, snapshotID string) (*
 	}
 	defer func() { _ = reader.Close() }()
 
-	// Decompress using zstd
-	zr, err := zstd.NewReader(reader)
+	// Decode manifest
+	manifest, err := snapshot.DecodeManifest(reader)
 	if err != nil {
-		return nil, fmt.Errorf("creating zstd reader: %w", err)
-	}
-	defer zr.Close()
-
-	// Decode JSON manifest
-	var manifest BlobManifest
-	if err := json.NewDecoder(zr).Decode(&manifest); err != nil {
 		return nil, fmt.Errorf("decoding manifest: %w", err)
 	}
 
-	return &manifest, nil
+	return manifest, nil
 }