refactor: wrap fiber.App in custom Server struct

- read database config from config file
- rename migration file to expected file name format

.devcontainer/devcontainer.json

@@ -1,5 +1,4 @@
 {
-	"name": "React + Bun + Convex Development",
 	"build": {
 		"context": ".",
 		"dockerfile": "Dockerfile"
@@ -7,11 +6,12 @@
 	"features": {
 		"ghcr.io/devcontainers/features/git:1": {},
 		"ghcr.io/devcontainers/features/github-cli:1": {},
-		"ghcr.io/devcontainers/features/docker-in-docker:2": {
-			"moby": false
-		},
 		"ghcr.io/tailscale/codespace/tailscale": {
 			"version": "latest"
+		},
+		"ghcr.io/devcontainers/features/go:1": {
+			"version": "1.25.4",
+			"golangciLintVersion": "2.6.1"
 		}
 	},
 	"postCreateCommand": "./scripts/setup-git.sh",
@@ -20,21 +20,11 @@
 			"extensions": [
 				"biomejs.biome",
 				"bradlc.vscode-tailwindcss",
-				"ms-vscode.vscode-typescript-next",
-				"esbenp.prettier-vscode",
-				"ms-vscode.vscode-json",
-				"formulahendry.auto-rename-tag",
 				"christian-kohler.path-intellisense",
-				"ms-vscode.vscode-eslint",
+				"golang.go"
-				"convex.convex-vscode"
 			],
 			"settings": {
-				"editor.defaultFormatter": "biomejs.biome",
 				"editor.formatOnSave": true,
-				"editor.codeActionsOnSave": {
-					"source.organizeImports.biome": "explicit",
-					"source.fixAll.biome": "explicit"
-				},
 				"typescript.preferences.importModuleSpecifier": "relative",
 				"typescript.suggest.autoImports": true,
 				"emmet.includeLanguages": {
@@ -44,7 +34,63 @@
 				"tailwindCSS.experimental.classRegex": [
 					["cva\\(([^)]*)\\)", "[\"'`]([^\"'`]*).*?[\"'`]"],
 					["cx\\(([^)]*)\\)", "(?:'|\"|`)([^']*)(?:'|\"|`)"]
-				]
+				],
+				"[javascript]": {
+					"editor.formatOnSave": true,
+					"editor.defaultFormatter": "biomejs.biome",
+					"editor.codeActionsOnSave": {
+						"source.organizeImports.biome": "explicit",
+						"source.fixAll.biome": "explicit"
+					}
+				},
+				"[javascriptreact]": {
+					"editor.formatOnSave": true,
+					"editor.defaultFormatter": "biomejs.biome",
+					"editor.codeActionsOnSave": {
+						"source.organizeImports.biome": "explicit",
+						"source.fixAll.biome": "explicit"
+					}
+				},
+				"[typescript]": {
+					"editor.formatOnSave": true,
+					"editor.defaultFormatter": "biomejs.biome",
+					"editor.codeActionsOnSave": {
+						"source.organizeImports.biome": "explicit",
+						"source.fixAll.biome": "explicit"
+					}
+				},
+				"[typescriptreact]": {
+					"editor.formatOnSave": true,
+					"editor.defaultFormatter": "biomejs.biome",
+					"editor.codeActionsOnSave": {
+						"source.organizeImports.biome": "explicit",
+						"source.fixAll.biome": "explicit"
+					}
+				},
+				"[json]": {
+					"editor.formatOnSave": true,
+					"editor.defaultFormatter": "biomejs.biome",
+					"editor.codeActionsOnSave": {
+						"source.fixAll.biome": "explicit"
+					}
+				},
+				"[jsonc]": {
+					"editor.formatOnSave": true,
+					"editor.defaultFormatter": "biomejs.biome",
+					"editor.codeActionsOnSave": {
+						"source.fixAll.biome": "explicit"
+					}
+				},
+				"[go]": {
+					"editor.formatOnSave": true,
+					"editor.defaultFormatter": "golang.go",
+					"editor.codeActionsOnSave": {
+						"source.organizeImports": "explicit"
+					}
+				},
+				"go.formatTool": "goimports",
+				"go.lintTool": "golangci-lint",
+				"go.useLanguageServer": true
 			}
 		}
 	},

apps/backend/cmd/drexa/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/get-drexa/drexa/internal/drexa"
+)
+
+func main() {
+	configPath := flag.String("config", "", "path to config file (required)")
+	flag.Parse()
+
+	if *configPath == "" {
+		fmt.Fprintln(os.Stderr, "error: --config is required")
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	config, err := drexa.ConfigFromFile(*configPath)
+	if err != nil {
+		log.Fatalf("failed to load config: %v", err)
+	}
+
+	server, err := drexa.NewServer(*config)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	log.Fatal(server.Start())
+}

apps/backend/cmd/migration/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/get-drexa/drexa/internal/database"
+	"github.com/get-drexa/drexa/internal/drexa"
+)
+
+func main() {
+	configPath := flag.String("config", "", "path to config file (required)")
+	flag.Parse()
+
+	if *configPath == "" {
+		fmt.Fprintln(os.Stderr, "error: --config is required")
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	config, err := drexa.ConfigFromFile(*configPath)
+	if err != nil {
+		log.Fatalf("failed to load config: %v", err)
+	}
+
+	db := database.NewFromPostgres(config.Database.PostgresURL)
+	defer db.Close()
+
+	log.Println("running migrations...")
+	if err := database.RunMigrations(context.Background(), db); err != nil {
+		log.Fatalf("failed to run migrations: %v", err)
+	}
+	log.Println("migrations completed successfully")
+}

apps/backend/config.example.yaml

@@ -0,0 +1,30 @@
+# Drexa Backend Configuration
+# Copy this file to config.yaml and adjust values for your environment.
+
+server:
+  port: 8080
+
+database:
+  postgres_url: postgres://user:password@localhost:5432/drexa?sslmode=disable
+
+jwt:
+  issuer: drexa
+  audience: drexa-api
+  # Secret key can be provided via (in order of precedence):
+  # 1. JWT_SECRET_KEY environment variable (base64 encoded)
+  # 2. secret_key_base64 below (base64 encoded)
+  # 3. secret_key_path below (file with base64 encoded content)
+  # secret_key_base64: "base64encodedkey"
+  secret_key_path: /run/secrets/jwt_secret_key
+
+storage:
+  # Mode: "flat" (UUID-based keys) or "hierarchical" (path-based keys)
+  # Note: S3 backend only supports "flat" mode
+  mode: flat
+  # Backend: "fs" (filesystem) or "s3" (not yet implemented)
+  backend: fs
+  # Required when backend is "fs"
+  root_path: /var/lib/drexa/blobs
+  # Required when backend is "s3"
+  # bucket: my-drexa-bucket
+

apps/backend/config.yaml

@@ -0,0 +1,15 @@
+server:
+  port: 8080
+
+database:
+  postgres_url: postgres://drexa:hunter2@helian:5433/drexa?sslmode=disable
+
+jwt:
+  issuer: drexa
+  audience: drexa-api
+  secret_key_base64: "pNeUExoqdakfecZLFL53NJpY4iB9zFot9EuEBItlYKY="
+
+storage:
+  mode: hierarchical
+  backend: fs
+  root_path: ./data

apps/backend/go.mod

@@ -0,0 +1,42 @@
+module github.com/get-drexa/drexa
+
+go 1.25.4
+
+require (
+	github.com/gabriel-vasile/mimetype v1.4.11
+	github.com/gofiber/fiber/v2 v2.52.9
+	github.com/google/uuid v1.6.0
+	github.com/sqids/sqids-go v0.4.1
+	github.com/uptrace/bun v1.2.16
+	github.com/uptrace/bun/extra/bundebug v1.2.16
+	golang.org/x/crypto v0.45.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/fatih/color v1.18.0 // indirect
+	go.opentelemetry.io/otel v1.38.0 // indirect
+	go.opentelemetry.io/otel/trace v1.38.0 // indirect
+	mellium.im/sasl v0.3.2 // indirect
+)
+
+require (
+	github.com/andybalholm/brotli v1.1.0 // indirect
+	github.com/golang-jwt/jwt/v5 v5.3.0
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/puzpuzpuz/xsync/v3 v3.5.1 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
+	github.com/tmthrgd/go-hex v0.0.0-20190904060850-447a3041c3bc // indirect
+	github.com/uptrace/bun/dialect/pgdialect v1.2.16
+	github.com/uptrace/bun/driver/pgdriver v1.2.16
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasthttp v1.51.0 // indirect
+	github.com/valyala/tcplisten v1.0.0 // indirect
+	github.com/vmihailenco/msgpack/v5 v5.4.1 // indirect
+	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+)

apps/backend/go.sum

@@ -0,0 +1,76 @@
+github.com/andybalholm/brotli v1.1.0 h1:eLKJA0d02Lf0mVpIDgYnqXcUn0GqVmEFny3VuID1U3M=
+github.com/andybalholm/brotli v1.1.0/go.mod h1:sms7XGricyQI9K10gOSf56VKKWS4oLer58Q+mhRPtnY=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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+github.com/fatih/color v1.18.0 h1:S8gINlzdQ840/4pfAwic/ZE0djQEH3wM94VfqLTZcOM=
+github.com/fatih/color v1.18.0/go.mod h1:4FelSpRwEGDpQ12mAdzqdOukCy4u8WUtOY6lkT/6HfU=
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+github.com/gofiber/fiber/v2 v2.52.9 h1:YjKl5DOiyP3j0mO61u3NTmK7or8GzzWzCFzkboyP5cw=
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+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+mellium.im/sasl v0.3.2 h1:PT6Xp7ccn9XaXAnJ03FcEjmAn7kK1x7aoXV6F+Vmrl0=
+mellium.im/sasl v0.3.2/go.mod h1:NKXDi1zkr+BlMHLQjY3ofYuU4KSPFxknb8mfEu6SveY=

apps/backend/internal/account/account.go

@@ -0,0 +1,23 @@
+package account
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+type Account struct {
+	bun.BaseModel `bun:"accounts"`
+
+	ID                uuid.UUID `bun:",pk,type:uuid" json:"id"`
+	UserID            uuid.UUID `bun:"user_id,notnull,type:uuid" json:"userId"`
+	StorageUsageBytes int64     `bun:"storage_usage_bytes,notnull" json:"storageUsageBytes"`
+	StorageQuotaBytes int64     `bun:"storage_quota_bytes,notnull" json:"storageQuotaBytes"`
+	CreatedAt         time.Time `bun:"created_at,notnull,nullzero" json:"createdAt"`
+	UpdatedAt         time.Time `bun:"updated_at,notnull,nullzero" json:"updatedAt"`
+}
+
+func newAccountID() (uuid.UUID, error) {
+	return uuid.NewV7()
+}

apps/backend/internal/account/err.go

@@ -0,0 +1,8 @@
+package account
+
+import "errors"
+
+var (
+	ErrAccountNotFound      = errors.New("account not found")
+	ErrAccountAlreadyExists = errors.New("account already exists")
+)

apps/backend/internal/account/http.go

@@ -0,0 +1,132 @@
+package account
+
+import (
+	"errors"
+
+	"github.com/get-drexa/drexa/internal/auth"
+	"github.com/get-drexa/drexa/internal/httperr"
+	"github.com/get-drexa/drexa/internal/user"
+	"github.com/gofiber/fiber/v2"
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+type HTTPHandler struct {
+	accountService *Service
+	authService    *auth.Service
+	db             *bun.DB
+	authMiddleware fiber.Handler
+}
+
+type registerAccountRequest struct {
+	Email       string `json:"email"`
+	Password    string `json:"password"`
+	DisplayName string `json:"displayName"`
+}
+
+type registerAccountResponse struct {
+	Account      *Account   `json:"account"`
+	User         *user.User `json:"user"`
+	AccessToken  string     `json:"accessToken"`
+	RefreshToken string     `json:"refreshToken"`
+}
+
+const currentAccountKey = "currentAccount"
+
+func CurrentAccount(c *fiber.Ctx) *Account {
+	return c.Locals(currentAccountKey).(*Account)
+}
+
+func NewHTTPHandler(accountService *Service, authService *auth.Service, db *bun.DB, authMiddleware fiber.Handler) *HTTPHandler {
+	return &HTTPHandler{accountService: accountService, authService: authService, db: db, authMiddleware: authMiddleware}
+}
+
+func (h *HTTPHandler) RegisterRoutes(api fiber.Router) fiber.Router {
+	api.Post("/accounts", h.registerAccount)
+
+	account := api.Group("/accounts/:accountID")
+	account.Use(h.authMiddleware)
+	account.Use(h.accountMiddleware)
+
+	account.Get("/", h.getAccount)
+
+	return account
+}
+
+func (h *HTTPHandler) accountMiddleware(c *fiber.Ctx) error {
+	user, err := auth.AuthenticatedUser(c)
+	if err != nil {
+		return c.SendStatus(fiber.StatusUnauthorized)
+	}
+
+	accountID, err := uuid.Parse(c.Params("accountID"))
+	if err != nil {
+		return c.SendStatus(fiber.StatusNotFound)
+	}
+
+	account, err := h.accountService.AccountByID(c.Context(), h.db, user.ID, accountID)
+	if err != nil {
+		if errors.Is(err, ErrAccountNotFound) {
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+		return httperr.Internal(err)
+	}
+
+	c.Locals(currentAccountKey, account)
+
+	return c.Next()
+}
+
+func (h *HTTPHandler) getAccount(c *fiber.Ctx) error {
+	account := CurrentAccount(c)
+	if account == nil {
+		return c.SendStatus(fiber.StatusNotFound)
+	}
+	return c.JSON(account)
+}
+
+func (h *HTTPHandler) registerAccount(c *fiber.Ctx) error {
+	req := new(registerAccountRequest)
+	if err := c.BodyParser(req); err != nil {
+		return c.SendStatus(fiber.StatusBadRequest)
+	}
+
+	tx, err := h.db.BeginTx(c.Context(), nil)
+	if err != nil {
+		return httperr.Internal(err)
+	}
+	defer tx.Rollback()
+
+	acc, u, err := h.accountService.Register(c.Context(), tx, RegisterOptions{
+		Email:       req.Email,
+		Password:    req.Password,
+		DisplayName: req.DisplayName,
+	})
+	if err != nil {
+		var ae *user.AlreadyExistsError
+		if errors.As(err, &ae) {
+			return c.SendStatus(fiber.StatusConflict)
+		}
+		if errors.Is(err, ErrAccountAlreadyExists) {
+			return c.SendStatus(fiber.StatusConflict)
+		}
+		return httperr.Internal(err)
+	}
+
+	result, err := h.authService.GenerateTokenForUser(c.Context(), tx, u)
+	if err != nil {
+		return httperr.Internal(err)
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		return httperr.Internal(err)
+	}
+
+	return c.JSON(registerAccountResponse{
+		Account:      acc,
+		User:         u,
+		AccessToken:  result.AccessToken,
+		RefreshToken: result.RefreshToken,
+	})
+}

apps/backend/internal/account/service.go

@@ -0,0 +1,115 @@
+package account
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+
+	"github.com/get-drexa/drexa/internal/database"
+	"github.com/get-drexa/drexa/internal/password"
+	"github.com/get-drexa/drexa/internal/user"
+	"github.com/get-drexa/drexa/internal/virtualfs"
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+type Service struct {
+	userService user.Service
+	vfs         *virtualfs.VirtualFS
+}
+
+type RegisterOptions struct {
+	Email       string
+	Password    string
+	DisplayName string
+}
+
+type CreateAccountOptions struct {
+	OrganizationID uuid.UUID
+	QuotaBytes     int64
+}
+
+func NewService(userService *user.Service, vfs *virtualfs.VirtualFS) *Service {
+	return &Service{
+		userService: *userService,
+		vfs:         vfs,
+	}
+}
+
+func (s *Service) Register(ctx context.Context, db bun.IDB, opts RegisterOptions) (*Account, *user.User, error) {
+	hashed, err := password.Hash(opts.Password)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	u, err := s.userService.RegisterUser(ctx, db, user.UserRegistrationOptions{
+		Email:       opts.Email,
+		Password:    hashed,
+		DisplayName: opts.DisplayName,
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	acc, err := s.CreateAccount(ctx, db, u.ID, CreateAccountOptions{
+		// TODO: make quota configurable
+		QuotaBytes: 1024 * 1024 * 1024, // 1GB
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	_, err = s.vfs.CreateDirectory(ctx, db, acc.ID, uuid.Nil, virtualfs.RootDirectoryName)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return acc, u, nil
+}
+
+func (s *Service) CreateAccount(ctx context.Context, db bun.IDB, userID uuid.UUID, opts CreateAccountOptions) (*Account, error) {
+	id, err := newAccountID()
+	if err != nil {
+		return nil, err
+	}
+
+	account := &Account{
+		ID:                id,
+		UserID:            userID,
+		StorageQuotaBytes: opts.QuotaBytes,
+	}
+
+	_, err = db.NewInsert().Model(account).Returning("*").Exec(ctx)
+	if err != nil {
+		if database.IsUniqueViolation(err) {
+			return nil, ErrAccountAlreadyExists
+		}
+		return nil, err
+	}
+
+	return account, nil
+}
+
+func (s *Service) AccountByUserID(ctx context.Context, db bun.IDB, userID uuid.UUID) (*Account, error) {
+	var account Account
+	err := db.NewSelect().Model(&account).Where("user_id = ?", userID).Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, ErrAccountNotFound
+		}
+		return nil, err
+	}
+	return &account, nil
+}
+
+func (s *Service) AccountByID(ctx context.Context, db bun.IDB, userID uuid.UUID, id uuid.UUID) (*Account, error) {
+	var account Account
+	err := db.NewSelect().Model(&account).Where("user_id = ?", userID).Where("id = ?", id).Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, ErrAccountNotFound
+		}
+		return nil, err
+	}
+	return &account, nil
+}

apps/backend/internal/auth/err.go

@@ -0,0 +1,24 @@
+package auth
+
+import (
+	"errors"
+	"fmt"
+)
+
+var ErrUnauthenticatedRequest = errors.New("unauthenticated request")
+
+type InvalidAccessTokenError struct {
+	err error
+}
+
+func newInvalidAccessTokenError(err error) *InvalidAccessTokenError {
+	return &InvalidAccessTokenError{err}
+}
+
+func (e *InvalidAccessTokenError) Error() string {
+	return fmt.Sprintf("invalid access token: %v", e.err)
+}
+
+func (e *InvalidAccessTokenError) Unwrap() error {
+	return e.err
+}

apps/backend/internal/auth/http.go

@@ -0,0 +1,66 @@
+package auth
+
+import (
+	"errors"
+
+	"github.com/get-drexa/drexa/internal/httperr"
+	"github.com/get-drexa/drexa/internal/user"
+	"github.com/gofiber/fiber/v2"
+	"github.com/uptrace/bun"
+)
+
+type loginRequest struct {
+	Email    string `json:"email"`
+	Password string `json:"password"`
+}
+
+type loginResponse struct {
+	User         user.User `json:"user"`
+	AccessToken  string    `json:"accessToken"`
+	RefreshToken string    `json:"refreshToken"`
+}
+
+type HTTPHandler struct {
+	service *Service
+	db      *bun.DB
+}
+
+func NewHTTPHandler(s *Service, db *bun.DB) *HTTPHandler {
+	return &HTTPHandler{service: s, db: db}
+}
+
+func (h *HTTPHandler) RegisterRoutes(api fiber.Router) {
+	auth := api.Group("/auth")
+	auth.Post("/login", h.Login)
+}
+
+func (h *HTTPHandler) Login(c *fiber.Ctx) error {
+	req := new(loginRequest)
+	if err := c.BodyParser(req); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request"})
+	}
+
+	tx, err := h.db.BeginTx(c.Context(), nil)
+	if err != nil {
+		return httperr.Internal(err)
+	}
+	defer tx.Rollback()
+
+	result, err := h.service.AuthenticateWithEmailAndPassword(c.Context(), tx, req.Email, req.Password)
+	if err != nil {
+		if errors.Is(err, ErrInvalidCredentials) {
+			return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{"error": "Invalid credentials"})
+		}
+		return httperr.Internal(err)
+	}
+
+	if err := tx.Commit(); err != nil {
+		return httperr.Internal(err)
+	}
+
+	return c.JSON(loginResponse{
+		User:         *result.User,
+		AccessToken:  result.AccessToken,
+		RefreshToken: result.RefreshToken,
+	})
+}

apps/backend/internal/auth/middleware.go

@@ -0,0 +1,63 @@
+package auth
+
+import (
+	"errors"
+	"log/slog"
+	"strings"
+
+	"github.com/get-drexa/drexa/internal/httperr"
+	"github.com/get-drexa/drexa/internal/user"
+	"github.com/gofiber/fiber/v2"
+	"github.com/uptrace/bun"
+)
+
+const authenticatedUserKey = "authenticatedUser"
+
+// NewBearerAuthMiddleware is a middleware that authenticates a request using a bearer token.
+// To obtain the authenticated user in subsequent handlers, see AuthenticatedUser.
+func NewBearerAuthMiddleware(s *Service, db *bun.DB) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		authHeader := c.Get("Authorization")
+		if authHeader == "" {
+			slog.Info("no auth header")
+			return c.SendStatus(fiber.StatusUnauthorized)
+		}
+
+		parts := strings.Split(authHeader, " ")
+		if len(parts) != 2 || parts[0] != "Bearer" {
+			slog.Info("invalid auth header")
+			return c.SendStatus(fiber.StatusUnauthorized)
+		}
+
+		token := parts[1]
+		u, err := s.AuthenticateWithAccessToken(c.Context(), db, token)
+		if err != nil {
+			var e *InvalidAccessTokenError
+			if errors.As(err, &e) {
+				slog.Info("invalid access token")
+				return c.SendStatus(fiber.StatusUnauthorized)
+			}
+
+			var nf *user.NotFoundError
+			if errors.As(err, &nf) {
+				slog.Info("user not found")
+				return c.SendStatus(fiber.StatusUnauthorized)
+			}
+
+			return httperr.Internal(err)
+		}
+
+		c.Locals(authenticatedUserKey, u)
+
+		return c.Next()
+	}
+}
+
+// AuthenticatedUser returns the authenticated user from the given fiber context.
+// Returns ErrUnauthenticatedRequest if not authenticated.
+func AuthenticatedUser(c *fiber.Ctx) (*user.User, error) {
+	if u, ok := c.Locals(authenticatedUserKey).(*user.User); ok {
+		return u, nil
+	}
+	return nil, ErrUnauthenticatedRequest
+}

apps/backend/internal/auth/service.go

@@ -0,0 +1,109 @@
+package auth
+
+import (
+	"context"
+	"encoding/hex"
+	"errors"
+	"log/slog"
+
+	"github.com/get-drexa/drexa/internal/password"
+	"github.com/get-drexa/drexa/internal/user"
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+type AuthenticationResult struct {
+	User         *user.User
+	AccessToken  string
+	RefreshToken string
+}
+
+var ErrInvalidCredentials = errors.New("invalid credentials")
+
+type Service struct {
+	userService *user.Service
+	tokenConfig TokenConfig
+}
+
+func NewService(userService *user.Service, tokenConfig TokenConfig) *Service {
+	return &Service{
+		userService: userService,
+		tokenConfig: tokenConfig,
+	}
+}
+
+func (s *Service) GenerateTokenForUser(ctx context.Context, db bun.IDB, user *user.User) (*AuthenticationResult, error) {
+	at, err := GenerateAccessToken(user, &s.tokenConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	rt, err := GenerateRefreshToken(user, &s.tokenConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = db.NewInsert().Model(rt).Exec(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &AuthenticationResult{
+		User:         user,
+		AccessToken:  at,
+		RefreshToken: hex.EncodeToString(rt.Token),
+	}, nil
+}
+
+func (s *Service) AuthenticateWithEmailAndPassword(ctx context.Context, db bun.IDB, email, plain string) (*AuthenticationResult, error) {
+	u, err := s.userService.UserByEmail(ctx, db, email)
+	if err != nil {
+		var nf *user.NotFoundError
+		if errors.As(err, &nf) {
+			return nil, ErrInvalidCredentials
+		}
+		return nil, err
+	}
+
+	ok, err := password.Verify(plain, u.Password)
+	if err != nil || !ok {
+		return nil, ErrInvalidCredentials
+	}
+
+	at, err := GenerateAccessToken(u, &s.tokenConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	rt, err := GenerateRefreshToken(u, &s.tokenConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = db.NewInsert().Model(rt).Exec(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &AuthenticationResult{
+		User:         u,
+		AccessToken:  at,
+		RefreshToken: hex.EncodeToString(rt.Token),
+	}, nil
+}
+
+func (s *Service) AuthenticateWithAccessToken(ctx context.Context, db bun.IDB, token string) (*user.User, error) {
+	claims, err := ParseAccessToken(token, &s.tokenConfig)
+	if err != nil {
+		slog.Info("failed to parse access token", "error", err)
+		return nil, err
+	}
+
+	id, err := uuid.Parse(claims.Subject)
+	if err != nil {
+		slog.Info("failed to parse access token subject", "error", err)
+		return nil, newInvalidAccessTokenError(err)
+	}
+
+	return s.userService.UserByID(ctx, db, id)
+}

apps/backend/internal/auth/tokens.go

@@ -0,0 +1,98 @@
+package auth
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"time"
+
+	"github.com/get-drexa/drexa/internal/user"
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+const (
+	accessTokenValidFor    = time.Minute * 15
+	refreshTokenByteLength = 32
+	refreshTokenValidFor   = time.Hour * 24 * 30
+)
+
+type TokenConfig struct {
+	Issuer    string
+	Audience  string
+	SecretKey []byte
+}
+
+type RefreshToken struct {
+	bun.BaseModel `bun:"refresh_tokens"`
+
+	ID        uuid.UUID `bun:",pk,type:uuid"`
+	UserID    uuid.UUID `bun:"user_id,notnull"`
+	Token     []byte    `bun:"-"`
+	TokenHash string    `bun:"token_hash,notnull"`
+	ExpiresAt time.Time `bun:"expires_at,notnull"`
+	CreatedAt time.Time `bun:"created_at,notnull,nullzero"`
+}
+
+func newTokenID() (uuid.UUID, error) {
+	return uuid.NewV7()
+}
+
+func GenerateAccessToken(user *user.User, c *TokenConfig) (string, error) {
+	now := time.Now()
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.RegisteredClaims{
+		Issuer:    c.Issuer,
+		Audience:  jwt.ClaimStrings{c.Audience},
+		Subject:   user.ID.String(),
+		ExpiresAt: jwt.NewNumericDate(now.Add(accessTokenValidFor)),
+		IssuedAt:  jwt.NewNumericDate(now),
+	})
+
+	signed, err := token.SignedString(c.SecretKey)
+	if err != nil {
+		return "", fmt.Errorf("failed to sign token: %w", err)
+	}
+
+	return signed, nil
+}
+
+func GenerateRefreshToken(user *user.User, c *TokenConfig) (*RefreshToken, error) {
+	now := time.Now()
+
+	buf := make([]byte, refreshTokenByteLength)
+	if _, err := rand.Read(buf); err != nil {
+		return nil, fmt.Errorf("failed to generate refresh token: %w", err)
+	}
+
+	id, err := newTokenID()
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate token ID: %w", err)
+	}
+
+	h := sha256.Sum256(buf)
+	hex := hex.EncodeToString(h[:])
+
+	return &RefreshToken{
+		ID:        id,
+		UserID:    user.ID,
+		Token:     buf,
+		TokenHash: hex,
+		ExpiresAt: now.Add(refreshTokenValidFor),
+		CreatedAt: now,
+	}, nil
+}
+
+// ParseAccessToken parses a JWT access token and returns the claims.
+// Returns an InvalidAccessTokenError if the token is invalid.
+func ParseAccessToken(token string, c *TokenConfig) (*jwt.RegisteredClaims, error) {
+	parsed, err := jwt.ParseWithClaims(token, &jwt.RegisteredClaims{}, func(token *jwt.Token) (any, error) {
+		return c.SecretKey, nil
+	}, jwt.WithIssuer(c.Issuer), jwt.WithExpirationRequired(), jwt.WithAudience(c.Audience))
+	if err != nil {
+		return nil, newInvalidAccessTokenError(err)
+	}
+	return parsed.Claims.(*jwt.RegisteredClaims), nil
+}

apps/backend/internal/blob/err.go

@@ -0,0 +1,9 @@
+package blob
+
+import "errors"
+
+var (
+	ErrConflict           = errors.New("key already used for a different blob")
+	ErrNotFound           = errors.New("key not found")
+	ErrInvalidFileContent = errors.New("invalid file content. must provide either a reader or a blob key")
+)

apps/backend/internal/blob/fs_store.go

@@ -0,0 +1,154 @@
+package blob
+
+import (
+	"context"
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/get-drexa/drexa/internal/ioext"
+)
+
+var _ Store = &FSStore{}
+
+type FSStore struct {
+	config FSStoreConfig
+}
+
+type FSStoreConfig struct {
+	Root string
+}
+
+func NewFSStore(config FSStoreConfig) *FSStore {
+	return &FSStore{config: config}
+}
+
+func (s *FSStore) Initialize(ctx context.Context) error {
+	return os.MkdirAll(s.config.Root, 0755)
+}
+
+func (s *FSStore) Put(ctx context.Context, key Key, reader io.Reader) error {
+	path := filepath.Join(s.config.Root, string(key))
+
+	err := os.MkdirAll(filepath.Dir(path), 0755)
+	if err != nil {
+		return err
+	}
+
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_EXCL, 0644)
+	if err != nil {
+		if os.IsExist(err) {
+			return ErrConflict
+		}
+		return err
+	}
+
+	defer f.Close()
+	_, err = io.Copy(f, reader)
+	if err != nil {
+		_ = os.Remove(path)
+		return err
+	}
+
+	return nil
+}
+
+func (s *FSStore) Read(ctx context.Context, key Key) (io.ReadCloser, error) {
+	path := filepath.Join(s.config.Root, string(key))
+	f, err := os.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, ErrNotFound
+		}
+		return nil, err
+	}
+	return f, nil
+}
+
+func (s *FSStore) ReadRange(ctx context.Context, key Key, offset, length int64) (io.ReadCloser, error) {
+	path := filepath.Join(s.config.Root, string(key))
+
+	f, err := os.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, ErrNotFound
+		}
+		return nil, err
+	}
+
+	_, err = f.Seek(offset, io.SeekStart)
+	if err != nil {
+		return nil, err
+	}
+
+	return ioext.NewLimitReadCloser(f, length), nil
+}
+
+func (s *FSStore) ReadSize(ctx context.Context, key Key) (int64, error) {
+	path := filepath.Join(s.config.Root, string(key))
+	fi, err := os.Stat(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return 0, ErrNotFound
+		}
+		return 0, err
+	}
+	return fi.Size(), nil
+}
+
+func (s *FSStore) Delete(ctx context.Context, key Key) error {
+	err := os.Remove(filepath.Join(s.config.Root, string(key)))
+	// no op if file does not exist
+	// swallow error if file does not exist
+	if err != nil && !os.IsNotExist(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *FSStore) DeletePrefix(ctx context.Context, prefix Key) error {
+	prefixPath := filepath.Join(s.config.Root, string(prefix))
+	err := os.RemoveAll(prefixPath)
+	if err != nil && !os.IsNotExist(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *FSStore) Update(ctx context.Context, key Key, opts UpdateOptions) error {
+	// Update is a no-op for FSStore
+	return nil
+}
+
+func (s *FSStore) Move(ctx context.Context, srcKey, dstKey Key) error {
+	oldPath := filepath.Join(s.config.Root, string(srcKey))
+	newPath := filepath.Join(s.config.Root, string(dstKey))
+
+	_, err := os.Stat(newPath)
+	if err == nil {
+		return ErrConflict
+	}
+
+	err = os.MkdirAll(filepath.Dir(newPath), 0755)
+	if err != nil {
+		return err
+	}
+
+	err = os.Rename(oldPath, newPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return ErrNotFound
+		}
+		return err
+	}
+
+	return nil
+}
+
+func (s *FSStore) SupportsDirectUpload() bool {
+	return false
+}
+
+func (s *FSStore) GenerateUploadURL(ctx context.Context, key Key, opts UploadURLOptions) (string, error) {
+	return "", nil
+}

apps/backend/internal/blob/key.go

@@ -0,0 +1,7 @@
+package blob
+
+type Key string
+
+func (k Key) IsNil() bool {
+	return k == ""
+}

apps/backend/internal/blob/store.go

@@ -0,0 +1,33 @@
+package blob
+
+import (
+	"context"
+	"io"
+	"time"
+)
+
+type UploadURLOptions struct {
+	Duration time.Duration
+}
+
+type UpdateOptions struct {
+	ContentType string
+}
+
+type Store interface {
+	Initialize(ctx context.Context) error
+	Put(ctx context.Context, key Key, reader io.Reader) error
+	Update(ctx context.Context, key Key, opts UpdateOptions) error
+	Delete(ctx context.Context, key Key) error
+	DeletePrefix(ctx context.Context, prefix Key) error
+	Move(ctx context.Context, srcKey, dstKey Key) error
+	Read(ctx context.Context, key Key) (io.ReadCloser, error)
+	ReadRange(ctx context.Context, key Key, offset, length int64) (io.ReadCloser, error)
+	ReadSize(ctx context.Context, key Key) (int64, error)
+
+	// SupportsDirectUpload returns true if the store allows files to be uploaded directly to the blob store.
+	SupportsDirectUpload() bool
+
+	// GenerateUploadURL generates a URL that can be used to upload a file directly to the blob store. If unsupported, returns an empty string with no error.
+	GenerateUploadURL(ctx context.Context, key Key, opts UploadURLOptions) (string, error)
+}

apps/backend/internal/database/errs.go

@@ -0,0 +1,61 @@
+package database
+
+import (
+	"errors"
+
+	"github.com/uptrace/bun/driver/pgdriver"
+)
+
+// PostgreSQL SQLSTATE error codes.
+// See: https://www.postgresql.org/docs/current/errcodes-appendix.html
+const (
+	PgUniqueViolation     = "23505"
+	PgForeignKeyViolation = "23503"
+	PgNotNullViolation    = "23502"
+)
+
+// PostgreSQL protocol error field identifiers used with pgdriver.Error.Field().
+// See: https://www.postgresql.org/docs/current/protocol-error-fields.html
+//
+// Common fields:
+//   - 'C' - SQLSTATE code (e.g., "23505")
+//   - 'M' - Primary error message
+//   - 'D' - Detail message
+//   - 'H' - Hint
+//   - 's' - Schema name
+//   - 't' - Table name
+//   - 'c' - Column name
+//   - 'n' - Constraint name
+const (
+	pgFieldCode       = 'C'
+	pgFieldConstraint = 'n'
+)
+
+// IsUniqueViolation checks if the error is a PostgreSQL unique constraint violation.
+func IsUniqueViolation(err error) bool {
+	return hasPgCode(err, PgUniqueViolation)
+}
+
+// IsForeignKeyViolation checks if the error is a PostgreSQL foreign key violation.
+func IsForeignKeyViolation(err error) bool {
+	return hasPgCode(err, PgForeignKeyViolation)
+}
+
+// IsNotNullViolation checks if the error is a PostgreSQL not-null constraint violation.
+func IsNotNullViolation(err error) bool {
+	return hasPgCode(err, PgNotNullViolation)
+}
+
+// ConstraintName returns the constraint name from a PostgreSQL error, or empty string if not applicable.
+func ConstraintName(err error) string {
+	var pgErr pgdriver.Error
+	if errors.As(err, &pgErr) {
+		return pgErr.Field(pgFieldConstraint)
+	}
+	return ""
+}
+
+func hasPgCode(err error, code string) bool {
+	var pgErr pgdriver.Error
+	return errors.As(err, &pgErr) && pgErr.Field(pgFieldCode) == code
+}

apps/backend/internal/database/migrate.go

@@ -0,0 +1,28 @@
+package database
+
+import (
+	"context"
+	"embed"
+
+	"github.com/uptrace/bun"
+	"github.com/uptrace/bun/migrate"
+)
+
+//go:embed migrations/*.sql
+var sqlMigrations embed.FS
+
+// RunMigrations discovers and runs all migrations against the database.
+func RunMigrations(ctx context.Context, db *bun.DB) error {
+	migrations := migrate.NewMigrations()
+	if err := migrations.Discover(sqlMigrations); err != nil {
+		return err
+	}
+
+	migrator := migrate.NewMigrator(db, migrations)
+	if err := migrator.Init(ctx); err != nil {
+		return err
+	}
+
+	_, err := migrator.Migrate(ctx)
+	return err
+}

apps/backend/internal/database/migrations/001_initial.up.sql

@@ -0,0 +1,106 @@
+-- ============================================================================
+-- Application Tables
+-- ============================================================================
+
+CREATE TABLE IF NOT EXISTS users (
+    id UUID PRIMARY KEY,
+    display_name TEXT,
+    email TEXT NOT NULL UNIQUE,
+    password TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_users_email ON users(email);
+
+CREATE TABLE IF NOT EXISTS accounts (
+    id UUID PRIMARY KEY,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    storage_usage_bytes BIGINT NOT NULL DEFAULT 0,
+    storage_quota_bytes BIGINT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_accounts_user_id ON accounts(user_id);
+
+CREATE TABLE IF NOT EXISTS refresh_tokens (
+    id UUID PRIMARY KEY,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    token_hash TEXT NOT NULL UNIQUE,
+    expires_at TIMESTAMPTZ NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_refresh_tokens_user_id ON refresh_tokens(user_id);
+CREATE INDEX idx_refresh_tokens_token_hash ON refresh_tokens(token_hash);
+CREATE INDEX idx_refresh_tokens_expires_at ON refresh_tokens(expires_at);
+
+-- Virtual filesystem nodes (unified files + directories)
+CREATE TABLE IF NOT EXISTS vfs_nodes (
+    id UUID PRIMARY KEY,
+    public_id TEXT NOT NULL UNIQUE,  -- opaque ID for external API (no timestamp leak)
+    account_id UUID NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,
+    parent_id UUID REFERENCES vfs_nodes(id) ON DELETE CASCADE,  -- NULL = root directory
+    kind TEXT NOT NULL CHECK (kind IN ('file', 'directory')),
+    status TEXT NOT NULL DEFAULT 'ready' CHECK (status IN ('pending', 'ready')),
+    name TEXT NOT NULL,
+    
+    -- File-specific fields (NULL for directories)
+    blob_key TEXT,      -- reference to blob storage (flat mode), NULL for hierarchical
+    size BIGINT,        -- file size in bytes
+    mime_type TEXT,     -- content type
+    
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ,  -- soft delete for trash
+    
+    -- No duplicate names in same parent (per account, excluding deleted)
+    CONSTRAINT unique_node_name UNIQUE NULLS NOT DISTINCT (account_id, parent_id, name, deleted_at)
+);
+
+CREATE INDEX idx_vfs_nodes_account_id ON vfs_nodes(account_id) WHERE deleted_at IS NULL;
+CREATE INDEX idx_vfs_nodes_parent_id ON vfs_nodes(parent_id) WHERE deleted_at IS NULL;
+CREATE INDEX idx_vfs_nodes_account_parent ON vfs_nodes(account_id, parent_id) WHERE deleted_at IS NULL;
+CREATE INDEX idx_vfs_nodes_kind ON vfs_nodes(account_id, kind) WHERE deleted_at IS NULL;
+CREATE INDEX idx_vfs_nodes_deleted ON vfs_nodes(account_id, deleted_at) WHERE deleted_at IS NOT NULL;
+CREATE INDEX idx_vfs_nodes_public_id ON vfs_nodes(public_id);
+CREATE UNIQUE INDEX idx_vfs_nodes_account_root ON vfs_nodes(account_id) WHERE parent_id IS NULL;  -- one root per account
+CREATE INDEX idx_vfs_nodes_pending ON vfs_nodes(created_at) WHERE status = 'pending';  -- for cleanup job
+
+CREATE TABLE IF NOT EXISTS node_shares (
+    id UUID PRIMARY KEY,
+    node_id UUID NOT NULL REFERENCES vfs_nodes(id) ON DELETE CASCADE,
+    share_token TEXT NOT NULL UNIQUE,
+    expires_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_node_shares_share_token ON node_shares(share_token);
+CREATE INDEX idx_node_shares_node_id ON node_shares(node_id);
+CREATE INDEX idx_node_shares_expires_at ON node_shares(expires_at) WHERE expires_at IS NOT NULL;
+
+-- ============================================================================
+-- Triggers for updated_at timestamps
+-- ============================================================================
+
+CREATE OR REPLACE FUNCTION update_updated_at_column()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER update_users_updated_at BEFORE UPDATE ON users
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+CREATE TRIGGER update_vfs_nodes_updated_at BEFORE UPDATE ON vfs_nodes
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+CREATE TRIGGER update_node_shares_updated_at BEFORE UPDATE ON node_shares
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+CREATE TRIGGER update_accounts_updated_at BEFORE UPDATE ON accounts
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();

apps/backend/internal/database/postgres.go

@@ -0,0 +1,27 @@
+package database
+
+import (
+	"database/sql"
+	"time"
+
+	"github.com/uptrace/bun"
+	"github.com/uptrace/bun/dialect/pgdialect"
+	"github.com/uptrace/bun/driver/pgdriver"
+)
+
+func NewFromPostgres(url string) *bun.DB {
+	sqldb := sql.OpenDB(pgdriver.NewConnector(pgdriver.WithDSN(url)))
+
+	// Configure connection pool to prevent "database closed" errors
+	// SetMaxOpenConns sets the maximum number of open connections to the database
+	sqldb.SetMaxOpenConns(25)
+	// SetMaxIdleConns sets the maximum number of connections in the idle connection pool
+	sqldb.SetMaxIdleConns(5)
+	// SetConnMaxLifetime sets the maximum amount of time a connection may be reused
+	sqldb.SetConnMaxLifetime(5 * time.Minute)
+	// SetConnMaxIdleTime sets the maximum amount of time a connection may be idle
+	sqldb.SetConnMaxIdleTime(10 * time.Minute)
+
+	db := bun.NewDB(sqldb, pgdialect.New())
+	return db
+}

apps/backend/internal/drexa/config.go

@@ -0,0 +1,155 @@
+package drexa
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type StorageMode string
+type StorageBackend string
+
+const (
+	StorageModeFlat         StorageMode = "flat"
+	StorageModeHierarchical StorageMode = "hierarchical"
+)
+
+const (
+	StorageBackendFS StorageBackend = "fs"
+	StorageBackendS3 StorageBackend = "s3"
+)
+
+type Config struct {
+	Server   ServerConfig   `yaml:"server"`
+	Database DatabaseConfig `yaml:"database"`
+	JWT      JWTConfig      `yaml:"jwt"`
+	Storage  StorageConfig  `yaml:"storage"`
+}
+
+type ServerConfig struct {
+	Port int `yaml:"port"`
+}
+
+type DatabaseConfig struct {
+	PostgresURL string `yaml:"postgres_url"`
+}
+
+type JWTConfig struct {
+	Issuer          string `yaml:"issuer"`
+	Audience        string `yaml:"audience"`
+	SecretKeyBase64 string `yaml:"secret_key_base64"`
+	SecretKeyPath   string `yaml:"secret_key_path"`
+	SecretKey       []byte `yaml:"-"`
+}
+
+type StorageConfig struct {
+	Mode     StorageMode    `yaml:"mode"`
+	Backend  StorageBackend `yaml:"backend"`
+	RootPath string         `yaml:"root_path"`
+	Bucket   string         `yaml:"bucket"`
+}
+
+// ConfigFromFile loads configuration from a YAML file.
+// JWT secret key is loaded from JWT_SECRET_KEY env var (base64 encoded),
+// falling back to the file path specified in jwt.secret_key_path.
+func ConfigFromFile(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, fmt.Errorf("config file not found: %s", path)
+		}
+		return nil, err
+	}
+
+	var config Config
+	if err := yaml.Unmarshal(data, &config); err != nil {
+		return nil, err
+	}
+
+	// Load JWT secret key (priority: env var > config base64 > config file path)
+	if envKey := os.Getenv("JWT_SECRET_KEY"); envKey != "" {
+		key, err := base64.StdEncoding.DecodeString(envKey)
+		if err != nil {
+			return nil, errors.New("JWT_SECRET_KEY env var is not valid base64")
+		}
+		config.JWT.SecretKey = key
+	} else if config.JWT.SecretKeyBase64 != "" {
+		key, err := base64.StdEncoding.DecodeString(config.JWT.SecretKeyBase64)
+		if err != nil {
+			return nil, errors.New("jwt.secret_key_base64 is not valid base64")
+		}
+		config.JWT.SecretKey = key
+	} else if config.JWT.SecretKeyPath != "" {
+		keyData, err := os.ReadFile(config.JWT.SecretKeyPath)
+		if err != nil {
+			return nil, err
+		}
+		key, err := base64.StdEncoding.DecodeString(string(keyData))
+		if err != nil {
+			return nil, errors.New("jwt.secret_key_path file content is not valid base64")
+		}
+		config.JWT.SecretKey = key
+	}
+
+	if errs := config.Validate(); len(errs) > 0 {
+		return nil, NewConfigError(errs...)
+	}
+
+	return &config, nil
+}
+
+// Validate checks for required configuration fields.
+func (c *Config) Validate() []error {
+	var errs []error
+
+	// Server
+	if c.Server.Port == 0 {
+		errs = append(errs, errors.New("server.port is required"))
+	}
+
+	// Database
+	if c.Database.PostgresURL == "" {
+		errs = append(errs, errors.New("database.postgres_url is required"))
+	}
+
+	// JWT
+	if c.JWT.Issuer == "" {
+		errs = append(errs, errors.New("jwt.issuer is required"))
+	}
+	if c.JWT.Audience == "" {
+		errs = append(errs, errors.New("jwt.audience is required"))
+	}
+	if len(c.JWT.SecretKey) == 0 {
+		errs = append(errs, errors.New("jwt secret key is required (set JWT_SECRET_KEY env var, jwt.secret_key_base64, or jwt.secret_key_path)"))
+	}
+
+	// Storage
+	if c.Storage.Mode == "" {
+		errs = append(errs, errors.New("storage.mode is required"))
+	} else if c.Storage.Mode != StorageModeFlat && c.Storage.Mode != StorageModeHierarchical {
+		errs = append(errs, errors.New("storage.mode must be 'flat' or 'hierarchical'"))
+	}
+
+	if c.Storage.Backend == "" {
+		errs = append(errs, errors.New("storage.backend is required"))
+	} else if c.Storage.Backend != StorageBackendFS && c.Storage.Backend != StorageBackendS3 {
+		errs = append(errs, errors.New("storage.backend must be 'fs' or 's3'"))
+	}
+
+	if c.Storage.Backend == StorageBackendFS && c.Storage.RootPath == "" {
+		errs = append(errs, errors.New("storage.root_path is required when backend is 'fs'"))
+	}
+	if c.Storage.Backend == StorageBackendS3 {
+		if c.Storage.Bucket == "" {
+			errs = append(errs, errors.New("storage.bucket is required when backend is 's3'"))
+		}
+		if c.Storage.Mode == StorageModeHierarchical {
+			errs = append(errs, errors.New("storage.mode must be 'flat' when backend is 's3'"))
+		}
+	}
+
+	return errs
+}

apps/backend/internal/drexa/err.go

@@ -0,0 +1,23 @@
+package drexa
+
+import (
+	"fmt"
+	"strings"
+)
+
+type ConfigError struct {
+	Errors []error
+}
+
+func NewConfigError(errs ...error) *ConfigError {
+	return &ConfigError{Errors: errs}
+}
+
+func (e *ConfigError) Error() string {
+	sb := strings.Builder{}
+	sb.WriteString("invalid config:\n")
+	for _, err := range e.Errors {
+		sb.WriteString(fmt.Sprintf("  - %s\n", err.Error()))
+	}
+	return sb.String()
+}

apps/backend/internal/drexa/server.go

@@ -0,0 +1,114 @@
+package drexa
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/get-drexa/drexa/internal/account"
+	"github.com/get-drexa/drexa/internal/auth"
+	"github.com/get-drexa/drexa/internal/blob"
+	"github.com/get-drexa/drexa/internal/database"
+	"github.com/get-drexa/drexa/internal/httperr"
+	"github.com/get-drexa/drexa/internal/upload"
+	"github.com/get-drexa/drexa/internal/user"
+	"github.com/get-drexa/drexa/internal/virtualfs"
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/logger"
+	"github.com/uptrace/bun"
+	"github.com/uptrace/bun/extra/bundebug"
+)
+
+type Server struct {
+	config         Config
+	app            *fiber.App
+	db             *bun.DB
+	blobStore      blob.Store
+	vfs            *virtualfs.VirtualFS
+	userService    *user.Service
+	authService    *auth.Service
+	accountService *account.Service
+	uploadService  *upload.Service
+	authMiddleware fiber.Handler
+}
+
+func NewServer(c Config) (*Server, error) {
+	app := fiber.New(fiber.Config{
+		ErrorHandler:      httperr.ErrorHandler,
+		StreamRequestBody: true,
+	})
+	app.Use(logger.New())
+
+	db := database.NewFromPostgres(c.Database.PostgresURL)
+	db.AddQueryHook(bundebug.NewQueryHook(bundebug.WithVerbose(true)))
+
+	// Initialize blob store based on config
+	var blobStore blob.Store
+	switch c.Storage.Backend {
+	case StorageBackendFS:
+		blobStore = blob.NewFSStore(blob.FSStoreConfig{
+			Root: c.Storage.RootPath,
+		})
+	case StorageBackendS3:
+		return nil, fmt.Errorf("s3 storage backend not yet implemented")
+	default:
+		return nil, fmt.Errorf("unknown storage backend: %s", c.Storage.Backend)
+	}
+
+	err := blobStore.Initialize(context.Background())
+	if err != nil {
+		return nil, fmt.Errorf("failed to initialize blob store: %w", err)
+	}
+
+	// Initialize key resolver based on config
+	var keyResolver virtualfs.BlobKeyResolver
+	switch c.Storage.Mode {
+	case StorageModeFlat:
+		keyResolver = virtualfs.NewFlatKeyResolver()
+	case StorageModeHierarchical:
+		keyResolver = virtualfs.NewHierarchicalKeyResolver(db)
+	default:
+		return nil, fmt.Errorf("unknown storage mode: %s", c.Storage.Mode)
+	}
+
+	vfs, err := virtualfs.NewVirtualFS(blobStore, keyResolver)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create virtual file system: %w", err)
+	}
+
+	userService := user.NewService()
+	authService := auth.NewService(userService, auth.TokenConfig{
+		Issuer:    c.JWT.Issuer,
+		Audience:  c.JWT.Audience,
+		SecretKey: c.JWT.SecretKey,
+	})
+	uploadService := upload.NewService(vfs, blobStore)
+	accountService := account.NewService(userService)
+
+	authMiddleware := auth.NewBearerAuthMiddleware(authService, db)
+
+	api := app.Group("/api")
+
+	accRouter := account.NewHTTPHandler(accountService, authService, db, authMiddleware).RegisterRoutes(api)
+
+	auth.NewHTTPHandler(authService, db).RegisterRoutes(api)
+	upload.NewHTTPHandler(uploadService, db).RegisterRoutes(accRouter)
+
+	s := &Server{
+		config:         c,
+		app:            app,
+		db:             db,
+		blobStore:      blobStore,
+		vfs:            vfs,
+		userService:    userService,
+		authService:    authService,
+		accountService: accountService,
+		uploadService:  uploadService,
+		authMiddleware: authMiddleware,
+	}
+
+	return s, nil
+}
+
+func (s *Server) Start() error {
+	return s.app.Listen(fmt.Sprintf(":%d", s.config.Server.Port))
+}

apps/backend/internal/httperr/error.go

@@ -0,0 +1,42 @@
+package httperr
+
+import (
+	"fmt"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+// HTTPError represents an HTTP error with a status code and underlying error.
+type HTTPError struct {
+	Code    int
+	Message string
+	Err     error
+}
+
+// Error implements the error interface.
+func (e *HTTPError) Error() string {
+	if e.Err != nil {
+		return fmt.Sprintf("HTTP %d: %s: %v", e.Code, e.Message, e.Err)
+	}
+	return fmt.Sprintf("HTTP %d: %s", e.Code, e.Message)
+}
+
+// Unwrap returns the underlying error.
+func (e *HTTPError) Unwrap() error {
+	return e.Err
+}
+
+// NewHTTPError creates a new HTTPError with the given status code, message, and underlying error.
+func NewHTTPError(code int, message string, err error) *HTTPError {
+	return &HTTPError{
+		Code:    code,
+		Message: message,
+		Err:     err,
+	}
+}
+
+// Internal creates a new HTTPError with status 500.
+func Internal(err error) *HTTPError {
+	return NewHTTPError(fiber.StatusInternalServerError, "Internal", err)
+}
+

apps/backend/internal/httperr/handler.go

@@ -0,0 +1,64 @@
+package httperr
+
+import (
+	"errors"
+	"log/slog"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+// ErrorHandler is a global error handler for Fiber that logs errors and returns appropriate responses.
+func ErrorHandler(c *fiber.Ctx, err error) error {
+	// Default status code
+	code := fiber.StatusInternalServerError
+	message := "Internal"
+
+	// Check if it's our custom HTTPError
+	var httpErr *HTTPError
+	if errors.As(err, &httpErr) {
+		code = httpErr.Code
+		message = httpErr.Message
+
+		// Log the error with underlying error details
+		if httpErr.Err != nil {
+			slog.Error("HTTP error",
+				"status", code,
+				"message", message,
+				"error", httpErr.Err.Error(),
+				"path", c.Path(),
+				"method", c.Method(),
+			)
+		} else {
+			slog.Warn("HTTP error",
+				"status", code,
+				"message", message,
+				"path", c.Path(),
+				"method", c.Method(),
+			)
+		}
+	} else {
+		// Check if it's a Fiber error
+		var fiberErr *fiber.Error
+		if errors.As(err, &fiberErr) {
+			code = fiberErr.Code
+			message = fiberErr.Message
+		} else {
+			// Generic error - log it
+			slog.Error("Unhandled error",
+				"status", code,
+				"error", err.Error(),
+				"path", c.Path(),
+				"method", c.Method(),
+			)
+		}
+	}
+
+	// Set Content-Type header
+	c.Set(fiber.HeaderContentType, fiber.MIMEApplicationJSONCharsetUTF8)
+
+	// Return JSON response
+	return c.Status(code).JSON(fiber.Map{
+		"error": message,
+	})
+}
+

apps/backend/internal/ioext/counting_reader.go

@@ -0,0 +1,23 @@
+package ioext
+
+import "io"
+
+type CountingReader struct {
+	reader io.Reader
+	count  int64
+}
+
+func NewCountingReader(reader io.Reader) *CountingReader {
+	return &CountingReader{reader: reader}
+}
+
+func (r *CountingReader) Read(p []byte) (n int, err error) {
+	n, err = r.reader.Read(p)
+	r.count += int64(n)
+	return n, err
+}
+
+func (r *CountingReader) Count() int64 {
+	return r.count
+}
+

apps/backend/internal/ioext/limit_read_closer.go

@@ -0,0 +1,24 @@
+package ioext
+
+import "io"
+
+type LimitReadCloser struct {
+	reader      io.ReadCloser
+	limitReader io.Reader
+}
+
+func NewLimitReadCloser(reader io.ReadCloser, length int64) *LimitReadCloser {
+	return &LimitReadCloser{
+		reader:      reader,
+		limitReader: io.LimitReader(reader, length),
+	}
+}
+
+func (r *LimitReadCloser) Read(p []byte) (n int, err error) {
+	return r.limitReader.Read(p)
+}
+
+func (r *LimitReadCloser) Close() error {
+	return r.reader.Close()
+}
+

apps/backend/internal/password/password.go

@@ -0,0 +1,138 @@
+package password
+
+import (
+	"crypto/rand"
+	"crypto/subtle"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"strings"
+
+	"golang.org/x/crypto/argon2"
+)
+
+// Hashed represents a securely hashed password.
+// This type ensures plaintext passwords cannot be accidentally stored.
+type Hashed string
+
+// argon2id parameters
+const (
+	memory      = 64 * 1024
+	iterations  = 3
+	parallelism = 2
+	saltLength  = 16
+	keyLength   = 32
+)
+
+var (
+	ErrInvalidHash         = errors.New("invalid hash format")
+	ErrIncompatibleHash    = errors.New("incompatible hash algorithm")
+	ErrIncompatibleVersion = errors.New("incompatible argon2 version")
+)
+
+type argon2Hash struct {
+	memory      uint32
+	iterations  uint32
+	parallelism uint8
+	salt        []byte
+	hash        []byte
+}
+
+// Hash securely hashes a plaintext password using argon2id.
+func Hash(plain string) (Hashed, error) {
+	salt := make([]byte, saltLength)
+	if _, err := rand.Read(salt); err != nil {
+		return "", fmt.Errorf("failed to generate salt: %w", err)
+	}
+
+	hash := argon2.IDKey(
+		[]byte(plain),
+		salt,
+		iterations,
+		memory,
+		parallelism,
+		keyLength,
+	)
+
+	b64Salt := base64.RawStdEncoding.EncodeToString(salt)
+	b64Hash := base64.RawStdEncoding.EncodeToString(hash)
+
+	encoded := fmt.Sprintf(
+		"$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
+		argon2.Version,
+		memory,
+		iterations,
+		parallelism,
+		b64Salt,
+		b64Hash,
+	)
+
+	return Hashed(encoded), nil
+}
+
+// Verify checks if a plaintext password matches a hashed password.
+func Verify(plain string, hashed Hashed) (bool, error) {
+	h, err := decodeHash(string(hashed))
+	if err != nil {
+		return false, err
+	}
+
+	otherHash := argon2.IDKey(
+		[]byte(plain),
+		h.salt,
+		h.iterations,
+		h.memory,
+		h.parallelism,
+		uint32(len(h.hash)),
+	)
+
+	if subtle.ConstantTimeCompare(h.hash, otherHash) == 1 {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func decodeHash(encodedHash string) (*argon2Hash, error) {
+	parts := strings.Split(encodedHash, "$")
+	if len(parts) != 6 {
+		return nil, ErrInvalidHash
+	}
+
+	if parts[1] != "argon2id" {
+		return nil, ErrIncompatibleHash
+	}
+
+	var version int
+	if _, err := fmt.Sscanf(parts[2], "v=%d", &version); err != nil {
+		return nil, fmt.Errorf("failed to parse version: %w", err)
+	}
+	if version != argon2.Version {
+		return nil, ErrIncompatibleVersion
+	}
+
+	h := &argon2Hash{}
+	if _, err := fmt.Sscanf(
+		parts[3],
+		"m=%d,t=%d,p=%d",
+		&h.memory,
+		&h.iterations,
+		&h.parallelism,
+	); err != nil {
+		return nil, fmt.Errorf("failed to parse parameters: %w", err)
+	}
+
+	salt, err := base64.RawStdEncoding.DecodeString(parts[4])
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode salt: %w", err)
+	}
+	h.salt = salt
+
+	hash, err := base64.RawStdEncoding.DecodeString(parts[5])
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode hash: %w", err)
+	}
+	h.hash = hash
+
+	return h, nil
+}

apps/backend/internal/upload/err.go

@@ -0,0 +1,10 @@
+package upload
+
+import "errors"
+
+var (
+	ErrNotFound           = errors.New("not found")
+	ErrParentNotDirectory = errors.New("parent is not a directory")
+	ErrConflict           = errors.New("node conflict")
+	ErrContentNotUploaded = errors.New("content has not been uploaded")
+)

apps/backend/internal/upload/http.go

@@ -0,0 +1,120 @@
+package upload
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/get-drexa/drexa/internal/account"
+	"github.com/get-drexa/drexa/internal/httperr"
+	"github.com/gofiber/fiber/v2"
+	"github.com/uptrace/bun"
+)
+
+type createUploadRequest struct {
+	ParentID string `json:"parentId"`
+	Name     string `json:"name"`
+}
+
+type updateUploadRequest struct {
+	Status Status `json:"status"`
+}
+
+type HTTPHandler struct {
+	service *Service
+	db      *bun.DB
+}
+
+func NewHTTPHandler(s *Service, db *bun.DB) *HTTPHandler {
+	return &HTTPHandler{service: s, db: db}
+}
+
+func (h *HTTPHandler) RegisterRoutes(api fiber.Router) {
+	upload := api.Group("/uploads")
+
+	upload.Post("/", h.Create)
+	upload.Put("/:uploadID/content", h.ReceiveContent)
+	upload.Patch("/:uploadID", h.Update)
+}
+
+func (h *HTTPHandler) Create(c *fiber.Ctx) error {
+	account := account.CurrentAccount(c)
+	if account == nil {
+		return c.SendStatus(fiber.StatusUnauthorized)
+	}
+
+	req := new(createUploadRequest)
+	if err := c.BodyParser(req); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request"})
+	}
+
+	upload, err := h.service.CreateUpload(c.Context(), h.db, account.ID, CreateUploadOptions{
+		ParentID: req.ParentID,
+		Name:     req.Name,
+	})
+	if err != nil {
+		if errors.Is(err, ErrNotFound) {
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+		if errors.Is(err, ErrParentNotDirectory) {
+			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Parent is not a directory"})
+		}
+		if errors.Is(err, ErrConflict) {
+			return c.Status(fiber.StatusConflict).JSON(fiber.Map{"error": "A file with this name already exists"})
+		}
+		return httperr.Internal(err)
+	}
+
+	if upload.UploadURL == "" {
+		upload.UploadURL = fmt.Sprintf("%s%s/%s/content", c.BaseURL(), c.OriginalURL(), upload.ID)
+	}
+
+	return c.JSON(upload)
+}
+
+func (h *HTTPHandler) ReceiveContent(c *fiber.Ctx) error {
+	account := account.CurrentAccount(c)
+	if account == nil {
+		return c.SendStatus(fiber.StatusUnauthorized)
+	}
+
+	uploadID := c.Params("uploadID")
+
+	err := h.service.ReceiveUpload(c.Context(), h.db, account.ID, uploadID, c.Context().RequestBodyStream())
+	defer c.Context().Request.CloseBodyStream()
+	if err != nil {
+		if errors.Is(err, ErrNotFound) {
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+		return httperr.Internal(err)
+	}
+
+	return c.SendStatus(fiber.StatusNoContent)
+}
+
+func (h *HTTPHandler) Update(c *fiber.Ctx) error {
+	account := account.CurrentAccount(c)
+	if account == nil {
+		return c.SendStatus(fiber.StatusUnauthorized)
+	}
+
+	req := new(updateUploadRequest)
+	if err := c.BodyParser(req); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request"})
+	}
+
+	if req.Status == StatusCompleted {
+		upload, err := h.service.CompleteUpload(c.Context(), h.db, account.ID, c.Params("uploadID"))
+		if err != nil {
+			if errors.Is(err, ErrNotFound) {
+				return c.SendStatus(fiber.StatusNotFound)
+			}
+			if errors.Is(err, ErrContentNotUploaded) {
+				return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Content has not been uploaded"})
+			}
+			return httperr.Internal(err)
+		}
+		return c.JSON(upload)
+	}
+
+	return c.SendStatus(fiber.StatusBadRequest)
+}

apps/backend/internal/upload/service.go

@@ -0,0 +1,144 @@
+package upload
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"sync"
+	"time"
+
+	"github.com/get-drexa/drexa/internal/blob"
+	"github.com/get-drexa/drexa/internal/virtualfs"
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+type Service struct {
+	vfs       *virtualfs.VirtualFS
+	blobStore blob.Store
+
+	pendingUploads sync.Map
+}
+
+func NewService(vfs *virtualfs.VirtualFS, blobStore blob.Store) *Service {
+	return &Service{
+		vfs:       vfs,
+		blobStore: blobStore,
+
+		pendingUploads: sync.Map{},
+	}
+}
+
+type CreateUploadOptions struct {
+	ParentID string
+	Name     string
+}
+
+func (s *Service) CreateUpload(ctx context.Context, db bun.IDB, accountID uuid.UUID, opts CreateUploadOptions) (*Upload, error) {
+	parentNode, err := s.vfs.FindNodeByPublicID(ctx, db, accountID, opts.ParentID)
+	if err != nil {
+		if errors.Is(err, virtualfs.ErrNodeNotFound) {
+			return nil, ErrNotFound
+		}
+		return nil, err
+	}
+
+	if parentNode.Kind != virtualfs.NodeKindDirectory {
+		return nil, ErrParentNotDirectory
+	}
+
+	node, err := s.vfs.CreateFile(ctx, db, accountID, virtualfs.CreateFileOptions{
+		ParentID: parentNode.ID,
+		Name:     opts.Name,
+	})
+	if err != nil {
+		if errors.Is(err, virtualfs.ErrNodeConflict) {
+			return nil, ErrConflict
+		}
+		return nil, err
+	}
+
+	var uploadURL string
+	if s.blobStore.SupportsDirectUpload() {
+		uploadURL, err = s.blobStore.GenerateUploadURL(ctx, node.BlobKey, blob.UploadURLOptions{
+			Duration: 1 * time.Hour,
+		})
+		if err != nil {
+			_ = s.vfs.PermanentlyDeleteNode(ctx, db, node)
+			return nil, err
+		}
+	} else {
+		uploadURL = ""
+	}
+
+	upload := &Upload{
+		ID:         node.PublicID,
+		Status:     StatusPending,
+		TargetNode: node,
+		UploadURL:  uploadURL,
+	}
+
+	s.pendingUploads.Store(upload.ID, upload)
+
+	return upload, nil
+}
+
+func (s *Service) ReceiveUpload(ctx context.Context, db bun.IDB, accountID uuid.UUID, uploadID string, reader io.Reader) error {
+	fmt.Printf("reader: %v\n", reader)
+	n, ok := s.pendingUploads.Load(uploadID)
+	if !ok {
+		return ErrNotFound
+	}
+
+	upload, ok := n.(*Upload)
+	if !ok {
+		return ErrNotFound
+	}
+
+	if upload.TargetNode.AccountID != accountID {
+		return ErrNotFound
+	}
+
+	err := s.vfs.WriteFile(ctx, db, upload.TargetNode, virtualfs.FileContentFromReader(reader))
+	if err != nil {
+		return err
+	}
+
+	upload.Status = StatusCompleted
+
+	return nil
+}
+
+func (s *Service) CompleteUpload(ctx context.Context, db bun.IDB, accountID uuid.UUID, uploadID string) (*Upload, error) {
+	n, ok := s.pendingUploads.Load(uploadID)
+	if !ok {
+		return nil, ErrNotFound
+	}
+
+	upload, ok := n.(*Upload)
+	if !ok {
+		return nil, ErrNotFound
+	}
+
+	if upload.TargetNode.AccountID != accountID {
+		return nil, ErrNotFound
+	}
+
+	if upload.TargetNode.Status == virtualfs.NodeStatusReady && upload.Status == StatusCompleted {
+		return upload, nil
+	}
+
+	err := s.vfs.WriteFile(ctx, db, upload.TargetNode, virtualfs.FileContentFromBlobKey(upload.TargetNode.BlobKey))
+	if err != nil {
+		if errors.Is(err, blob.ErrNotFound) {
+			return nil, ErrContentNotUploaded
+		}
+		return nil, err
+	}
+
+	upload.Status = StatusCompleted
+	s.pendingUploads.Delete(uploadID)
+
+	return upload, nil
+}

apps/backend/internal/upload/upload.go

@@ -0,0 +1,18 @@
+package upload
+
+import "github.com/get-drexa/drexa/internal/virtualfs"
+
+type Status string
+
+const (
+	StatusPending   Status = "pending"
+	StatusCompleted Status = "completed"
+	StatusFailed    Status = "failed"
+)
+
+type Upload struct {
+	ID         string          `json:"id"`
+	Status     Status          `json:"status"`
+	TargetNode *virtualfs.Node `json:"-"`
+	UploadURL  string          `json:"uploadUrl"`
+}

apps/backend/internal/user/err.go

@@ -0,0 +1,36 @@
+package user
+
+import (
+	"fmt"
+
+	"github.com/google/uuid"
+)
+
+type NotFoundError struct {
+	// ID is the ID that was used to try to find the user.
+	// Not set if not tried.
+	id uuid.UUID
+
+	// Email is the email that was used to try to find the user.
+	// Not set if not tried.
+	email string
+}
+
+func newNotFoundError(id uuid.UUID, email string) *NotFoundError {
+	return &NotFoundError{id, email}
+}
+func (e *NotFoundError) Error() string {
+	return fmt.Sprintf("user not found: %v", e.id)
+}
+
+type AlreadyExistsError struct {
+	// Email is the email that was used to try to create the user.
+	Email string
+}
+
+func newAlreadyExistsError(email string) *AlreadyExistsError {
+	return &AlreadyExistsError{email}
+}
+func (e *AlreadyExistsError) Error() string {
+	return fmt.Sprintf("user with email %s already exists", e.Email)
+}

apps/backend/internal/user/service.go

@@ -0,0 +1,76 @@
+package user
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+
+	"github.com/get-drexa/drexa/internal/database"
+	"github.com/get-drexa/drexa/internal/password"
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+type Service struct{}
+
+type UserRegistrationOptions struct {
+	Email       string
+	DisplayName string
+	Password    password.Hashed
+}
+
+func NewService() *Service {
+	return &Service{}
+}
+
+func (s *Service) RegisterUser(ctx context.Context, db bun.IDB, opts UserRegistrationOptions) (*User, error) {
+	uid, err := newUserID()
+	if err != nil {
+		return nil, err
+	}
+
+	u := User{
+		ID:          uid,
+		Email:       opts.Email,
+		DisplayName: opts.DisplayName,
+		Password:    opts.Password,
+	}
+
+	_, err = db.NewInsert().Model(&u).Returning("*").Exec(ctx)
+	if err != nil {
+		if database.IsUniqueViolation(err) {
+			return nil, newAlreadyExistsError(u.Email)
+		}
+		return nil, err
+	}
+
+	return &u, nil
+}
+
+func (s *Service) UserByID(ctx context.Context, db bun.IDB, id uuid.UUID) (*User, error) {
+	var user User
+	err := db.NewSelect().Model(&user).Where("id = ?", id).Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, newNotFoundError(id, "")
+		}
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (s *Service) UserByEmail(ctx context.Context, db bun.IDB, email string) (*User, error) {
+	var user User
+	err := db.NewSelect().Model(&user).Where("email = ?", email).Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, newNotFoundError(uuid.Nil, email)
+		}
+		return nil, err
+	}
+	return &user, nil
+}
+
+func (s *Service) UserExistsByEmail(ctx context.Context, db bun.IDB, email string) (bool, error) {
+	return db.NewSelect().Model(&User{}).Where("email = ?", email).Exists(ctx)
+}

apps/backend/internal/user/user.go

@@ -0,0 +1,24 @@
+package user
+
+import (
+	"time"
+
+	"github.com/get-drexa/drexa/internal/password"
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+type User struct {
+	bun.BaseModel `bun:"users"`
+
+	ID          uuid.UUID       `bun:",pk,type:uuid" json:"id"`
+	DisplayName string          `bun:"display_name" json:"displayName"`
+	Email       string          `bun:"email,unique,notnull" json:"email"`
+	Password    password.Hashed `bun:"password,notnull" json:"-"`
+	CreatedAt   time.Time       `bun:"created_at,notnull,nullzero" json:"createdAt"`
+	UpdatedAt   time.Time       `bun:"updated_at,notnull,nullzero" json:"updatedAt"`
+}
+
+func newUserID() (uuid.UUID, error) {
+	return uuid.NewV7()
+}

apps/backend/internal/virtualfs/err.go

@@ -0,0 +1,9 @@
+package virtualfs
+
+import "errors"
+
+var (
+	ErrNodeNotFound         = errors.New("node not found")
+	ErrNodeConflict         = errors.New("node conflict")
+	ErrUnsupportedOperation = errors.New("unsupported operation")
+)

apps/backend/internal/virtualfs/flat_key_resolver.go

@@ -0,0 +1,35 @@
+package virtualfs
+
+import (
+	"context"
+
+	"github.com/get-drexa/drexa/internal/blob"
+	"github.com/google/uuid"
+)
+
+type FlatKeyResolver struct{}
+
+var _ BlobKeyResolver = &FlatKeyResolver{}
+
+func NewFlatKeyResolver() *FlatKeyResolver {
+	return &FlatKeyResolver{}
+}
+
+func (r *FlatKeyResolver) ShouldPersistKey() bool {
+	return true
+}
+
+func (r *FlatKeyResolver) Resolve(ctx context.Context, node *Node) (blob.Key, error) {
+	if node.BlobKey == "" {
+		id, err := uuid.NewV7()
+		if err != nil {
+			return "", err
+		}
+		return blob.Key(id.String()), nil
+	}
+	return node.BlobKey, nil
+}
+
+func (r *FlatKeyResolver) ResolveDeletionKeys(ctx context.Context, node *Node, allKeys []blob.Key) (*DeletionPlan, error) {
+	return &DeletionPlan{Keys: allKeys}, nil
+}

apps/backend/internal/virtualfs/hierarchical_key_resolver.go

@@ -0,0 +1,40 @@
+package virtualfs
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/get-drexa/drexa/internal/blob"
+	"github.com/uptrace/bun"
+)
+
+type HierarchicalKeyResolver struct {
+	db *bun.DB
+}
+
+var _ BlobKeyResolver = &HierarchicalKeyResolver{}
+
+func NewHierarchicalKeyResolver(db *bun.DB) *HierarchicalKeyResolver {
+	return &HierarchicalKeyResolver{db: db}
+}
+
+func (r *HierarchicalKeyResolver) ShouldPersistKey() bool {
+	return false
+}
+
+func (r *HierarchicalKeyResolver) Resolve(ctx context.Context, node *Node) (blob.Key, error) {
+	path, err := buildNodeAbsolutePath(ctx, r.db, node.ID)
+	if err != nil {
+		return "", err
+	}
+
+	return blob.Key(fmt.Sprintf("%s/%s", node.AccountID, path)), nil
+}
+
+func (r *HierarchicalKeyResolver) ResolveDeletionKeys(ctx context.Context, node *Node, allKeys []blob.Key) (*DeletionPlan, error) {
+	path, err := buildNodeAbsolutePath(ctx, r.db, node.ID)
+	if err != nil {
+		return nil, err
+	}
+	return &DeletionPlan{Prefix: blob.Key(path)}, nil
+}

apps/backend/internal/virtualfs/key_resolver.go

@@ -0,0 +1,21 @@
+package virtualfs
+
+import (
+	"context"
+
+	"github.com/get-drexa/drexa/internal/blob"
+)
+
+type BlobKeyResolver interface {
+	// ShouldPersistKey returns true if the resolved key should be stored in node.BlobKey.
+	// Flat keys (e.g. UUIDs) return true - key is generated once and stored.
+	// Hierarchical keys return false - key is derived from path each time.
+	ShouldPersistKey() bool
+	Resolve(ctx context.Context, node *Node) (blob.Key, error)
+	ResolveDeletionKeys(ctx context.Context, node *Node, allKeys []blob.Key) (*DeletionPlan, error)
+}
+
+type DeletionPlan struct {
+	Prefix blob.Key
+	Keys   []blob.Key
+}

apps/backend/internal/virtualfs/node.go

@@ -0,0 +1,53 @@
+package virtualfs
+
+import (
+	"time"
+
+	"github.com/get-drexa/drexa/internal/blob"
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+type NodeKind string
+
+const (
+	NodeKindFile      NodeKind = "file"
+	NodeKindDirectory NodeKind = "directory"
+)
+
+type NodeStatus string
+
+const (
+	NodeStatusPending NodeStatus = "pending"
+	NodeStatusReady   NodeStatus = "ready"
+)
+
+type Node struct {
+	bun.BaseModel `bun:"vfs_nodes"`
+
+	ID        uuid.UUID  `bun:",pk,type:uuid"`
+	PublicID  string     `bun:"public_id,notnull"`
+	AccountID uuid.UUID  `bun:"account_id,notnull,type:uuid"`
+	ParentID  uuid.UUID  `bun:"parent_id,nullzero"`
+	Kind      NodeKind   `bun:"kind,notnull"`
+	Status    NodeStatus `bun:"status,notnull"`
+	Name      string     `bun:"name,notnull"`
+
+	BlobKey  blob.Key `bun:"blob_key,nullzero"`
+	Size     int64    `bun:"size"`
+	MimeType string   `bun:"mime_type,nullzero"`
+
+	CreatedAt time.Time `bun:"created_at,notnull,nullzero"`
+	UpdatedAt time.Time `bun:"updated_at,notnull,nullzero"`
+	DeletedAt time.Time `bun:"deleted_at,nullzero"`
+}
+
+func newNodeID() (uuid.UUID, error) {
+	return uuid.NewV7()
+}
+
+// IsAccessible returns true if the node can be accessed.
+// If the node is not ready or if it is soft deleted, it cannot be accessed.
+func (n *Node) IsAccessible() bool {
+	return n.DeletedAt.IsZero() && n.Status == NodeStatusReady
+}

apps/backend/internal/virtualfs/path.go

@@ -0,0 +1,42 @@
+package virtualfs
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"strings"
+
+	"github.com/google/uuid"
+	"github.com/uptrace/bun"
+)
+
+const absolutePathQuery = `WITH RECURSIVE path AS (
+    SELECT id, parent_id, name, 1 as depth
+    FROM vfs_nodes WHERE id = ? AND deleted_at IS NULL
+    
+    UNION ALL
+    
+    SELECT n.id, n.parent_id, n.name, p.depth + 1
+    FROM vfs_nodes n
+    JOIN path p ON n.id = p.parent_id
+    WHERE n.deleted_at IS NULL
+)
+SELECT name FROM path 
+WHERE EXISTS (SELECT 1 FROM path WHERE parent_id IS NULL)
+ORDER BY depth DESC;`
+
+func JoinPath(parts ...string) string {
+	return strings.Join(parts, "/")
+}
+
+func buildNodeAbsolutePath(ctx context.Context, db bun.IDB, nodeID uuid.UUID) (string, error) {
+	var path []string
+	err := db.NewRaw(absolutePathQuery, nodeID).Scan(ctx, &path)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return "", ErrNodeNotFound
+		}
+		return "", err
+	}
+	return JoinPath(path...), nil
+}

apps/backend/internal/virtualfs/vfs.go

@@ -0,0 +1,520 @@
+package virtualfs
+
+import (
+	"bytes"
+	"context"
+	"crypto/rand"
+	"database/sql"
+	"encoding/binary"
+	"errors"
+	"io"
+
+	"github.com/gabriel-vasile/mimetype"
+	"github.com/get-drexa/drexa/internal/blob"
+	"github.com/get-drexa/drexa/internal/database"
+	"github.com/get-drexa/drexa/internal/ioext"
+	"github.com/google/uuid"
+	"github.com/sqids/sqids-go"
+	"github.com/uptrace/bun"
+)
+
+type VirtualFS struct {
+	blobStore   blob.Store
+	keyResolver BlobKeyResolver
+
+	sqid *sqids.Sqids
+}
+
+type CreateNodeOptions struct {
+	ParentID uuid.UUID
+	Kind     NodeKind
+	Name     string
+}
+
+type CreateFileOptions struct {
+	ParentID uuid.UUID
+	Name     string
+}
+
+type FileContent struct {
+	reader  io.Reader
+	blobKey blob.Key
+}
+
+const RootDirectoryName = "root"
+
+func FileContentFromReader(reader io.Reader) FileContent {
+	return FileContent{reader: reader}
+}
+
+func FileContentFromBlobKey(blobKey blob.Key) FileContent {
+	return FileContent{blobKey: blobKey}
+}
+
+func NewVirtualFS(blobStore blob.Store, keyResolver BlobKeyResolver) (*VirtualFS, error) {
+	sqid, err := sqids.New()
+	if err != nil {
+		return nil, err
+	}
+	return &VirtualFS{
+		blobStore:   blobStore,
+		keyResolver: keyResolver,
+		sqid:        sqid,
+	}, nil
+}
+
+func (vfs *VirtualFS) FindNode(ctx context.Context, db bun.IDB, accountID, fileID string) (*Node, error) {
+	var node Node
+	err := db.NewSelect().Model(&node).
+		Where("account_id = ?", accountID).
+		Where("id = ?", fileID).
+		Where("status = ?", NodeStatusReady).
+		Where("deleted_at IS NULL").
+		Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, ErrNodeNotFound
+		}
+		return nil, err
+	}
+	return &node, nil
+}
+
+func (vfs *VirtualFS) FindNodeByPublicID(ctx context.Context, db bun.IDB, accountID uuid.UUID, publicID string) (*Node, error) {
+	var node Node
+	err := db.NewSelect().Model(&node).
+		Where("account_id = ?", accountID).
+		Where("public_id = ?", publicID).
+		Where("status = ?", NodeStatusReady).
+		Where("deleted_at IS NULL").
+		Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, ErrNodeNotFound
+		}
+		return nil, err
+	}
+	return &node, nil
+}
+
+func (vfs *VirtualFS) ListChildren(ctx context.Context, db bun.IDB, node *Node) ([]*Node, error) {
+	if !node.IsAccessible() {
+		return nil, ErrNodeNotFound
+	}
+
+	var nodes []*Node
+	err := db.NewSelect().Model(&nodes).
+		Where("account_id = ?", node.AccountID).
+		Where("parent_id = ?", node.ID).
+		Where("status = ?", NodeStatusReady).
+		Where("deleted_at IS NULL").
+		Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return make([]*Node, 0), nil
+		}
+		return nil, err
+	}
+
+	return nodes, nil
+}
+
+func (vfs *VirtualFS) CreateFile(ctx context.Context, db bun.IDB, accountID uuid.UUID, opts CreateFileOptions) (*Node, error) {
+	pid, err := vfs.generatePublicID()
+	if err != nil {
+		return nil, err
+	}
+
+	id, err := newNodeID()
+	if err != nil {
+		return nil, err
+	}
+
+	node := Node{
+		ID:        id,
+		PublicID:  pid,
+		AccountID: accountID,
+		ParentID:  opts.ParentID,
+		Kind:      NodeKindFile,
+		Status:    NodeStatusPending,
+		Name:      opts.Name,
+	}
+
+	if vfs.keyResolver.ShouldPersistKey() {
+		node.BlobKey, err = vfs.keyResolver.Resolve(ctx, &node)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	_, err = db.NewInsert().Model(&node).Returning("*").Exec(ctx)
+	if err != nil {
+		if database.IsUniqueViolation(err) {
+			return nil, ErrNodeConflict
+		}
+		return nil, err
+	}
+
+	return &node, nil
+}
+
+func (vfs *VirtualFS) WriteFile(ctx context.Context, db bun.IDB, node *Node, content FileContent) error {
+	if content.reader == nil && content.blobKey.IsNil() {
+		return blob.ErrInvalidFileContent
+	}
+
+	if !node.DeletedAt.IsZero() {
+		return ErrNodeNotFound
+	}
+
+	setCols := make([]string, 0, 4)
+
+	if content.reader != nil {
+		key, err := vfs.keyResolver.Resolve(ctx, node)
+		if err != nil {
+			return err
+		}
+
+		buf := make([]byte, 3072)
+		n, err := io.ReadFull(content.reader, buf)
+		if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
+			return err
+		}
+		buf = buf[:n]
+
+		mt := mimetype.Detect(buf)
+		cr := ioext.NewCountingReader(io.MultiReader(bytes.NewReader(buf), content.reader))
+
+		err = vfs.blobStore.Put(ctx, key, cr)
+		if err != nil {
+			return err
+		}
+
+		if vfs.keyResolver.ShouldPersistKey() {
+			node.BlobKey = key
+			setCols = append(setCols, "blob_key")
+		}
+
+		node.MimeType = mt.String()
+		node.Size = cr.Count()
+		node.Status = NodeStatusReady
+
+		setCols = append(setCols, "mime_type", "size", "status")
+	} else {
+		node.BlobKey = content.blobKey
+
+		b, err := vfs.blobStore.ReadRange(ctx, content.blobKey, 0, 3072)
+		if err != nil {
+			return err
+		}
+		defer b.Close()
+
+		buf := make([]byte, 3072)
+		n, err := io.ReadFull(b, buf)
+		if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
+			return err
+		}
+		buf = buf[:n]
+		mt := mimetype.Detect(buf)
+		node.MimeType = mt.String()
+		node.Status = NodeStatusReady
+
+		s, err := vfs.blobStore.ReadSize(ctx, content.blobKey)
+		if err != nil {
+			return err
+		}
+		node.Size = s
+
+		setCols = append(setCols, "mime_type", "blob_key", "size", "status")
+	}
+
+	_, err := db.NewUpdate().Model(node).
+		Column(setCols...).
+		WherePK().
+		Exec(ctx)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (vfs *VirtualFS) CreateDirectory(ctx context.Context, db bun.IDB, accountID uuid.UUID, parentID uuid.UUID, name string) (*Node, error) {
+	pid, err := vfs.generatePublicID()
+	if err != nil {
+		return nil, err
+	}
+
+	id, err := newNodeID()
+	if err != nil {
+		return nil, err
+	}
+
+	node := Node{
+		ID:        id,
+		PublicID:  pid,
+		AccountID: accountID,
+		ParentID:  parentID,
+		Kind:      NodeKindDirectory,
+		Status:    NodeStatusReady,
+		Name:      name,
+	}
+
+	_, err = db.NewInsert().Model(node).Exec(ctx)
+	if err != nil {
+		if database.IsUniqueViolation(err) {
+			return nil, ErrNodeConflict
+		}
+		return nil, err
+	}
+
+	return &node, nil
+}
+
+func (vfs *VirtualFS) SoftDeleteNode(ctx context.Context, db bun.IDB, node *Node) error {
+	if !node.IsAccessible() {
+		return ErrNodeNotFound
+	}
+
+	_, err := db.NewUpdate().Model(node).
+		WherePK().
+		Where("deleted_at IS NULL").
+		Where("status = ?", NodeStatusReady).
+		Set("deleted_at = NOW()").
+		Returning("deleted_at").
+		Exec(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrNodeNotFound
+		}
+		return err
+	}
+
+	return nil
+}
+
+func (vfs *VirtualFS) RestoreNode(ctx context.Context, db bun.IDB, node *Node) error {
+	if node.Status != NodeStatusReady {
+		return ErrNodeNotFound
+	}
+
+	_, err := db.NewUpdate().Model(node).
+		WherePK().
+		Where("deleted_at IS NOT NULL").
+		Set("deleted_at = NULL").
+		Returning("deleted_at").
+		Exec(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrNodeNotFound
+		}
+		return err
+	}
+
+	return nil
+}
+
+func (vfs *VirtualFS) RenameNode(ctx context.Context, db bun.IDB, node *Node, name string) error {
+	if !node.IsAccessible() {
+		return ErrNodeNotFound
+	}
+
+	_, err := db.NewUpdate().Model(node).
+		WherePK().
+		Where("status = ?", NodeStatusReady).
+		Where("deleted_at IS NULL").
+		Set("name = ?", name).
+		Returning("name, updated_at").
+		Exec(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrNodeNotFound
+		}
+		return err
+	}
+	return nil
+}
+
+func (vfs *VirtualFS) MoveNode(ctx context.Context, db bun.IDB, node *Node, parentID uuid.UUID) error {
+	if !node.IsAccessible() {
+		return ErrNodeNotFound
+	}
+
+	oldKey, err := vfs.keyResolver.Resolve(ctx, node)
+	if err != nil {
+		return err
+	}
+
+	_, err = db.NewUpdate().Model(node).
+		WherePK().
+		Where("status = ?", NodeStatusReady).
+		Where("deleted_at IS NULL").
+		Set("parent_id = ?", parentID).
+		Returning("parent_id, updated_at").
+		Exec(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrNodeNotFound
+		}
+		if database.IsUniqueViolation(err) {
+			return ErrNodeConflict
+		}
+		return err
+	}
+
+	newKey, err := vfs.keyResolver.Resolve(ctx, node)
+	if err != nil {
+		return err
+	}
+
+	err = vfs.blobStore.Move(ctx, oldKey, newKey)
+	if err != nil {
+		return err
+	}
+
+	if vfs.keyResolver.ShouldPersistKey() {
+		node.BlobKey = newKey
+		_, err = db.NewUpdate().Model(node).
+			WherePK().
+			Set("blob_key = ?", newKey).
+			Exec(ctx)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (vfs *VirtualFS) AbsolutePath(ctx context.Context, db bun.IDB, node *Node) (string, error) {
+	if !node.IsAccessible() {
+		return "", ErrNodeNotFound
+	}
+	return buildNodeAbsolutePath(ctx, db, node.ID)
+}
+
+func (vfs *VirtualFS) PermanentlyDeleteNode(ctx context.Context, db bun.IDB, node *Node) error {
+	if !node.IsAccessible() {
+		return ErrNodeNotFound
+	}
+	switch node.Kind {
+	case NodeKindFile:
+		return vfs.permanentlyDeleteFileNode(ctx, db, node)
+	case NodeKindDirectory:
+		return vfs.permanentlyDeleteDirectoryNode(ctx, db, node)
+	default:
+		return ErrUnsupportedOperation
+	}
+}
+
+func (vfs *VirtualFS) permanentlyDeleteFileNode(ctx context.Context, db bun.IDB, node *Node) error {
+	err := vfs.blobStore.Delete(ctx, node.BlobKey)
+	if err != nil {
+		return err
+	}
+
+	_, err = db.NewDelete().Model(node).WherePK().Exec(ctx)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (vfs *VirtualFS) permanentlyDeleteDirectoryNode(ctx context.Context, db bun.IDB, node *Node) error {
+	const descendantsQuery = `WITH RECURSIVE descendants AS (
+		SELECT id, blob_key FROM vfs_nodes WHERE id = ?
+		UNION ALL
+		SELECT n.id, n.blob_key FROM vfs_nodes n
+		JOIN descendants d ON n.parent_id = d.id
+	)
+	SELECT id, blob_key FROM descendants`
+
+	type nodeRecord struct {
+		ID      uuid.UUID `bun:"id"`
+		BlobKey blob.Key  `bun:"blob_key"`
+	}
+
+	// If db is already a transaction, use it directly; otherwise start a new transaction
+	var tx bun.IDB
+	var startedTx *bun.Tx
+	switch v := db.(type) {
+	case *bun.DB:
+		newTx, err := v.BeginTx(ctx, nil)
+		if err != nil {
+			return err
+		}
+		startedTx = &newTx
+		tx = newTx
+		defer func() {
+			if startedTx != nil {
+				(*startedTx).Rollback()
+			}
+		}()
+	default:
+		// Assume it's already a transaction
+		tx = db
+	}
+
+	var records []nodeRecord
+	err := tx.NewRaw(descendantsQuery, node.ID).Scan(ctx, &records)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrNodeNotFound
+		}
+		return err
+	}
+
+	if len(records) == 0 {
+		return ErrNodeNotFound
+	}
+
+	nodeIDs := make([]uuid.UUID, 0, len(records))
+	blobKeys := make([]blob.Key, 0, len(records))
+	for _, r := range records {
+		nodeIDs = append(nodeIDs, r.ID)
+		if !r.BlobKey.IsNil() {
+			blobKeys = append(blobKeys, r.BlobKey)
+		}
+	}
+
+	plan, err := vfs.keyResolver.ResolveDeletionKeys(ctx, node, blobKeys)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.NewDelete().
+		Model((*Node)(nil)).
+		Where("id IN (?)", bun.In(nodeIDs)).
+		Exec(ctx)
+	if err != nil {
+		return err
+	}
+
+	if !plan.Prefix.IsNil() {
+		_ = vfs.blobStore.DeletePrefix(ctx, plan.Prefix)
+	} else {
+		for _, key := range plan.Keys {
+			_ = vfs.blobStore.Delete(ctx, key)
+		}
+	}
+
+	// Only commit if we started the transaction
+	if startedTx != nil {
+		err := (*startedTx).Commit()
+		startedTx = nil // Prevent defer from rolling back
+		return err
+	}
+
+	return nil
+}
+
+func (vfs *VirtualFS) generatePublicID() (string, error) {
+	var b [8]byte
+	_, err := rand.Read(b[:])
+	if err != nil {
+		return "", err
+	}
+	n := binary.BigEndian.Uint64(b[:])
+	return vfs.sqid.Encode([]uint64{n})
+}

scripts/install-vscode-extensions.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+# Install VS Code extensions from devcontainer.json
+# This script reads extensions from the single source of truth
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DEVCONTAINER_JSON="$SCRIPT_DIR/../.devcontainer/devcontainer.json"
+
+echo "Installing VS Code extensions from devcontainer.json..."
+
+if [ ! -f "$DEVCONTAINER_JSON" ]; then
+    echo "Error: devcontainer.json not found at $DEVCONTAINER_JSON"
+    exit 1
+fi
+
+# Use Bun to parse JSON and extract extensions
+EXTENSIONS=$(bun -e "
+const config = await Bun.file('$DEVCONTAINER_JSON').json();
+const extensions = config?.customizations?.vscode?.extensions ?? [];
+console.log(extensions.join('\n'));
+")
+
+if [ -z "$EXTENSIONS" ]; then
+    echo "No extensions found in devcontainer.json"
+    exit 0
+fi
+
+# Determine which CLI to use (code-server, cursor, or code)
+if command -v code-server &> /dev/null; then
+    CLI="code-server"
+elif command -v cursor &> /dev/null; then
+    CLI="cursor"
+elif command -v code &> /dev/null; then
+    CLI="code"
+else
+    echo "Warning: No VS Code CLI found (code-server, cursor, or code)"
+    echo "Extensions to install:"
+    echo "$EXTENSIONS"
+    exit 0
+fi
+
+echo "Using $CLI to install extensions..."
+
+# Install each extension
+echo "$EXTENSIONS" | while read -r ext; do
+    if [ -n "$ext" ]; then
+        echo "Installing: $ext"
+        $CLI --install-extension "$ext" 2>/dev/null || true
+    fi
+done
+
+echo "Extension installation complete!"