commit 746cebf509c26bada372fe4eb146402b05ac44e1
Author: zervo <marco@zervo.org>
Date:   Fri Nov 7 13:40:22 2025 +0100

    Initial commit

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..8ddffd9
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,19 @@
+BINARY_NAME=worktime
+VERSION=$(shell git describe --tags $(shel git rev-list --tags --max-count=1) || echo "v0.0.0")
+COMMIT=$(shell git rev-parse --short HEAD || echo "?")
+
+all: build test
+
+build:
+	go build -ldflags "-X 'git.zervo.org/zervo/worktime/internal/cli/commands/version.Version=$(VERSION)' -X 'git.zervo.org/zervo/worktime/internal/cli/commands/version.Commit=$(COMMIT)'" -o $(BINARY_NAME) cmd/worktime/main.go
+
+test:
+	go test -v cmd/worktime/main.go
+
+run:
+	go build -ldflags "-X 'git.zervo.org/zervo/worktime/internal/cli/commands/version.Version=$(VERSION)' -X 'git.zervo.org/zervo/worktime/internal/cli/commands/version.Commit=$(COMMIT)'" -o $(BINARY_NAME) cmd/worktime/main.go
+	./$(BINARY_NAME) $(ARGS)
+
+clean:
+	go clean
+	rm $(BINARY_NAME)
\ No newline at end of file
diff --git a/cmd/worktime/main.go b/cmd/worktime/main.go
new file mode 100644
index 0000000..bb07977
--- /dev/null
+++ b/cmd/worktime/main.go
@@ -0,0 +1,9 @@
+package main
+
+import (
+	"git.zervo.org/zervo/worktime/internal/cli/commands"
+)
+
+func main() {
+	commands.Execute()
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..6314c1a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,19 @@
+module git.zervo.org/zervo/worktime
+
+go 1.25.1
+
+require (
+	github.com/google/uuid v1.6.0
+	gorm.io/driver/sqlite v1.6.0
+	gorm.io/gorm v1.31.1
+)
+
+require (
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.5 // indirect
+	github.com/mattn/go-sqlite3 v1.14.32 // indirect
+	github.com/spf13/cobra v1.10.1
+	github.com/spf13/pflag v1.0.10 // indirect
+	golang.org/x/text v0.30.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..3611052
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,25 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
+github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.32 h1:JD12Ag3oLy1zQA+BNn74xRgaBbdhbNIDYvQUEuuErjs=
+github.com/mattn/go-sqlite3 v1.14.32/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.10.1 h1:lJeBwCfmrnXthfAupyUTzJ/J4Nc1RsHC/mSRU2dll/s=
+github.com/spf13/cobra v1.10.1/go.mod h1:7SmJGaTHFVBY0jW4NXGluQoLvhqFQM+6XSKD+P4XaB0=
+github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
+github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+golang.org/x/text v0.30.0 h1:yznKA/E9zq54KzlzBEAWn1NXSQ8DIp/NYMy88xJjl4k=
+golang.org/x/text v0.30.0/go.mod h1:yDdHFIX9t+tORqspjENWgzaCVXgk0yYnYuSZ8UzzBVM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gorm.io/driver/sqlite v1.6.0 h1:WHRRrIiulaPiPFmDcod6prc4l2VGVWHz80KspNsxSfQ=
+gorm.io/driver/sqlite v1.6.0/go.mod h1:AO9V1qIQddBESngQUKWL9yoH93HIeA1X6V633rBwyT8=
+gorm.io/gorm v1.31.1 h1:7CA8FTFz/gRfgqgpeKIBcervUn3xSyPUmr6B2WXJ7kg=
+gorm.io/gorm v1.31.1/go.mod h1:XyQVbO2k6YkOis7C2437jSit3SsDK72s7n7rsSHd+Gs=
diff --git a/internal/cli/color/color.go b/internal/cli/color/color.go
new file mode 100644
index 0000000..96688be
--- /dev/null
+++ b/internal/cli/color/color.go
@@ -0,0 +1,60 @@
+package color
+
+const (
+	// Reset all attributes
+	Reset = "\033[0m"
+
+	// Regular Colors
+	Black   = "\033[30m"
+	Red     = "\033[31m"
+	Green   = "\033[32m"
+	Yellow  = "\033[33m"
+	Blue    = "\033[34m"
+	Magenta = "\033[35m"
+	Cyan    = "\033[36m"
+	White   = "\033[37m"
+
+	// Bright Colors
+	BrightBlack   = "\033[90m"
+	BrightRed     = "\033[91m"
+	BrightGreen   = "\033[92m"
+	BrightYellow  = "\033[93m"
+	BrightBlue    = "\033[94m"
+	BrightMagenta = "\033[95m"
+	BrightCyan    = "\033[96m"
+	BrightWhite   = "\033[97m"
+
+	// Background Colors
+	BgBlack   = "\033[40m"
+	BgRed     = "\033[41m"
+	BgGreen   = "\033[42m"
+	BgYellow  = "\033[43m"
+	BgBlue    = "\033[44m"
+	BgMagenta = "\033[45m"
+	BgCyan    = "\033[46m"
+	BgWhite   = "\033[47m"
+
+	// Bright Background Colors
+	BgBrightBlack   = "\033[100m"
+	BgBrightRed     = "\033[101m"
+	BgBrightGreen   = "\033[102m"
+	BgBrightYellow  = "\033[103m"
+	BgBrightBlue    = "\033[104m"
+	BgBrightMagenta = "\033[105m"
+	BgBrightCyan    = "\033[106m"
+	BgBrightWhite   = "\033[107m"
+
+	// Text styles
+	Bold      = "\033[1m"
+	Dim       = "\033[2m"
+	Italic    = "\033[3m"
+	Underline = "\033[4m"
+	Blink     = "\033[5m"
+	Reverse   = "\033[7m"
+	Hidden    = "\033[8m"
+	Strike    = "\033[9m"
+)
+
+func Colorize(s string, color string) string {
+	return color + s + Reset
+}
diff --git a/internal/cli/commands/group/add.go b/internal/cli/commands/group/add.go
new file mode 100644
index 0000000..1e18015
--- /dev/null
+++ b/internal/cli/commands/group/add.go
@@ -0,0 +1,52 @@
+package group
+
+import (
+	"context"
+	"fmt"
+
+	"git.zervo.org/zervo/worktime/internal/database"
+	"git.zervo.org/zervo/worktime/internal/database/models"
+	"github.com/spf13/cobra"
+	"gorm.io/gorm"
+)
+
+var addCmd = &cobra.Command{
+	Use:   "add [flags] (name) [description]",
+	Short: "Add a group",
+	Long:  `Create a new locally stored project group`,
+	Args:  cobra.MatchAll(cobra.MinimumNArgs(1), cobra.MaximumNArgs(2)),
+	RunE:  addExecute,
+}
+
+func addExecute(cmd *cobra.Command, args []string) error {
+	name := args[0]
+	desc := ""
+
+	if len(args) > 1 {
+		desc = args[1]
+	}
+
+	if len(name) > 255 {
+		return fmt.Errorf("given name is too long (%d): maximum allowed length is 255", len(name))
+	}
+
+	db := database.DB()
+	ctx := context.Background()
+
+	_, err := gorm.G[models.ProjectGroup](db).Where("name = ?", name).First(ctx)
+	if err != gorm.ErrRecordNotFound {
+		return fmt.Errorf("group with this name already exists")
+	}
+
+	group := models.ProjectGroup{
+		Name:        name,
+		Description: desc,
+	}
+
+	err = gorm.G[models.ProjectGroup](db).Create(ctx, &group)
+	if err != nil {
+		return fmt.Errorf("could not add group: %v", err)
+	}
+
+	return nil
+}
diff --git a/internal/cli/commands/group/edit.go b/internal/cli/commands/group/edit.go
new file mode 100644
index 0000000..e724022
--- /dev/null
+++ b/internal/cli/commands/group/edit.go
@@ -0,0 +1,57 @@
+package group
+
+import (
+	"context"
+	"fmt"
+
+	"git.zervo.org/zervo/worktime/internal/database"
+	"git.zervo.org/zervo/worktime/internal/database/models"
+	"github.com/spf13/cobra"
+	"gorm.io/gorm"
+)
+
+var editCmd = &cobra.Command{
+	Use:   "edit [flags] (group) (field) (value)",
+	Short: "Edit details for a group",
+	Long: `Edit details, such as name or description, for a locally stored project group.
+Specify group by ID or name, which can be found with 'group list'.
+Specify either 'name' or 'description' as field.
+Specify new desired value as value.`,
+	Args: cobra.ExactArgs(3),
+	RunE: editExecute,
+}
+
+func editExecute(cmd *cobra.Command, args []string) error {
+	groupId := args[0]
+	field := args[1]
+	value := args[2]
+
+	if len(value) > 255 {
+		return fmt.Errorf("given value is too long (%d): maximum allowed length is 255", len(value))
+	}
+
+	db := database.DB()
+	ctx := context.Background()
+
+	group, err := gorm.G[models.ProjectGroup](db).Where("id = ?", groupId).First(ctx)
+	if err == gorm.ErrRecordNotFound {
+		group, err = gorm.G[models.ProjectGroup](db).Where("name = ?", groupId).First(ctx)
+		if err == gorm.ErrRecordNotFound {
+			return fmt.Errorf("no group with given name or ID found")
+		}
+	}
+
+	switch field {
+	case "name":
+		group.Name = value
+	case "description":
+		group.Description = value
+	default:
+		return fmt.Errorf("uknown field '%s': expected 'name' or 'description'", field)
+	}
+
+	db.Save(&group)
+
+	fmt.Println("Edited project!")
+	return nil
+}
diff --git a/internal/cli/commands/group/group.go b/internal/cli/commands/group/group.go
new file mode 100644
index 0000000..54d3146
--- /dev/null
+++ b/internal/cli/commands/group/group.go
@@ -0,0 +1,18 @@
+package group
+
+import (
+	"github.com/spf13/cobra"
+)
+
+var Cmd = &cobra.Command{
+	Use:   "group",
+	Short: "Manage project groups",
+	Long:  `List, edit, add or remove logical groups used to organize projects`,
+}
+
+func init() {
+	Cmd.AddCommand(listCmd)
+	Cmd.AddCommand(addCmd)
+	Cmd.AddCommand(removeCmd)
+	Cmd.AddCommand(editCmd)
+}
diff --git a/internal/cli/commands/group/list.go b/internal/cli/commands/group/list.go
new file mode 100644
index 0000000..588913e
--- /dev/null
+++ b/internal/cli/commands/group/list.go
@@ -0,0 +1,32 @@
+package group
+
+import (
+	"context"
+	"fmt"
+
+	"git.zervo.org/zervo/worktime/internal/database"
+	"git.zervo.org/zervo/worktime/internal/database/models"
+	"github.com/spf13/cobra"
+	"gorm.io/gorm"
+)
+
+var listCmd = &cobra.Command{
+	Use:   "list",
+	Short: "List all groups",
+	Long:  `List all locally stored project groups`,
+	RunE:  listExecute,
+}
+
+func listExecute(cmd *cobra.Command, args []string) error {
+	db := database.DB()
+	ctx := context.Background()
+
+	groups, err := gorm.G[models.ProjectGroup](db).Find(ctx)
+	if err != nil {
+		return fmt.Errorf("aaa")
+	}
+
+	fmt.Printf("Amount: %d\n", len(groups))
+
+	return nil
+}
diff --git a/internal/cli/commands/group/remove.go b/internal/cli/commands/group/remove.go
new file mode 100644
index 0000000..d745c2e
--- /dev/null
+++ b/internal/cli/commands/group/remove.go
@@ -0,0 +1,18 @@
+package group
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var removeCmd = &cobra.Command{
+	Use:   "remove",
+	Short: "Remove a group",
+	Long:  `Remove a locally stored project group`,
+	Run:   removeExecute,
+}
+
+func removeExecute(cmd *cobra.Command, args []string) {
+	fmt.Println("Removing!")
+}
diff --git a/internal/cli/commands/root.go b/internal/cli/commands/root.go
new file mode 100644
index 0000000..d0cb041
--- /dev/null
+++ b/internal/cli/commands/root.go
@@ -0,0 +1,41 @@
+package commands
+
+import (
+	"fmt"
+	"os"
+
+	cmd_group "git.zervo.org/zervo/worktime/internal/cli/commands/group"
+	cmd_version "git.zervo.org/zervo/worktime/internal/cli/commands/version"
+	"git.zervo.org/zervo/worktime/internal/util"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	verbose bool
+
+	rootCmd = &cobra.Command{
+		Use:   "worktime",
+		Short: "WorkTime is a CLI project time management utility",
+		Long: `WorkTime is a CLI time management utility for keeping track of time spent on different projects.
+Can associate git directories and user-provided summaries with sessions. Exports to CSVs or directly to PDFs.`,
+	}
+)
+
+// Execute will execute the root command of the application
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func init() {
+	rootCmd.SetErrPrefix("ERROR:")
+	rootCmd.SetErr(util.NewErrorWriter())
+
+	rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "V", false, "increase output verbosity")
+
+	rootCmd.AddCommand(cmd_version.Cmd)
+	rootCmd.AddCommand(cmd_group.Cmd)
+}
diff --git a/internal/cli/commands/version/version.go b/internal/cli/commands/version/version.go
new file mode 100644
index 0000000..4500a5e
--- /dev/null
+++ b/internal/cli/commands/version/version.go
@@ -0,0 +1,21 @@
+package version
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	Version string = "dev"
+	Commit  string = "none"
+)
+
+var Cmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print version information",
+	Long:  `Print the WorkTime version information of this WorkTime binary`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("WorkTime. Version: %s, Commit: %s\n", Version, Commit)
+	},
+}
diff --git a/internal/cli/pretty/builder.go b/internal/cli/pretty/builder.go
new file mode 100644
index 0000000..62c2efe
--- /dev/null
+++ b/internal/cli/pretty/builder.go
@@ -0,0 +1,34 @@
+package pretty
+
+import "strings"
+
+type PrettyBuilder struct {
+	lines   []string
+	padding int
+	border  bool
+}
+
+// NewBuilder creates and returns a new empty builder
+func NewBuilder() *PrettyBuilder {
+	return &PrettyBuilder{
+		lines: []string{""},
+	}
+}
+
+// NewBuilderFromString creates and returns a new builder based on the string
+func NewBuilderFromString(s string) *PrettyBuilder {
+	lines := strings.Split(strings.Trim(s, "\n"), "\n")
+	return &PrettyBuilder{
+		lines: lines,
+	}
+}
+
+// AppendString adds a string to the builder line buffer
+func (pb *PrettyBuilder) AppendString(s string) *PrettyBuilder {
+	if strings.HasSuffix(s, "\n") {
+		pb.lines = append(pb.lines, strings.Trim(s, "\n"))
+		return pb
+	}
+	pb.lines[len(pb.lines)-1] = pb.lines[len(pb.lines)-1] + s
+	return pb
+}
diff --git a/internal/database/db.go b/internal/database/db.go
new file mode 100644
index 0000000..c41e2b1
--- /dev/null
+++ b/internal/database/db.go
@@ -0,0 +1,56 @@
+package database
+
+import (
+	"fmt"
+	"log"
+	"path/filepath"
+
+	"git.zervo.org/zervo/worktime/internal/database/models"
+	"git.zervo.org/zervo/worktime/internal/util"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+var db *gorm.DB
+
+var migrations []any = []any{
+	&models.ProjectGroup{},
+	&models.Project{},
+	&models.Session{},
+	&models.SessionPause{},
+	&models.SyncTarget{},
+}
+
+// migrate migrates the given database
+func migrate(db *gorm.DB) error {
+	for _, model := range migrations {
+		if err := db.AutoMigrate(model); err != nil {
+			return fmt.Errorf("migrate %T: %v", model, err)
+		}
+	}
+	return nil
+}
+
+// connect will open and prepare the local sqlite database
+func connect() {
+	dbPath := filepath.Join(util.GetWorkDir(), "data.db")
+
+	var err error = nil
+	db, err = gorm.Open(sqlite.Open(dbPath), &gorm.Config{})
+	if err != nil {
+		log.Fatalf("Failed to open database: %v", err)
+	}
+
+	err = migrate(db)
+	if err != nil {
+		log.Fatalf("Failed to migrate database: %v", err)
+	}
+}
+
+// DB returns the global database connection instance
+func DB() *gorm.DB {
+	if db == nil {
+		connect()
+	}
+	return db
+}
diff --git a/internal/database/models/base.go b/internal/database/models/base.go
new file mode 100644
index 0000000..2ccf5b6
--- /dev/null
+++ b/internal/database/models/base.go
@@ -0,0 +1,20 @@
+package models
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type Base struct {
+	ID        string         `gorm:"column:id;<-:create;type:uuid;primaryKey;unique" json:"id"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"deleted_at"`
+}
+
+func (b *Base) BeforeCreate(tx *gorm.DB) (err error) {
+	b.ID = uuid.NewString()
+	return
+}
diff --git a/internal/database/models/project.go b/internal/database/models/project.go
new file mode 100644
index 0000000..f1d63f5
--- /dev/null
+++ b/internal/database/models/project.go
@@ -0,0 +1,8 @@
+package models
+
+type Project struct {
+	Base
+	GroupID     string `gorm:"column:group_id;<-;type:uuid" json:"group_id"`
+	Name        string `gorm:"column:name;<-;size:255;not null;unique" json:"name"`
+	Description string `gorm:"column:description;<-" json:"description"`
+}
diff --git a/internal/database/models/project_group.go b/internal/database/models/project_group.go
new file mode 100644
index 0000000..e209524
--- /dev/null
+++ b/internal/database/models/project_group.go
@@ -0,0 +1,7 @@
+package models
+
+type ProjectGroup struct {
+	Base
+	Name        string `gorm:"column:name;<-;size:255;not null;unique" json:"name"`
+	Description string `gorm:"column:description;<-" json:"description"`
+}
diff --git a/internal/database/models/session.go b/internal/database/models/session.go
new file mode 100644
index 0000000..823c422
--- /dev/null
+++ b/internal/database/models/session.go
@@ -0,0 +1,17 @@
+package models
+
+import (
+	"time"
+
+	"git.zervo.org/zervo/worktime/internal/types"
+)
+
+type Session struct {
+	Base
+	ProjectID  string             `gorm:"column:project_id;<-:create;type:uuid" json:"project_id"`
+	State      types.SessionState `gorm:"column:state;<-;type:int" json:"state"`
+	Summary    string             `gorm:"column:summary;<-" json:"summary"`
+	Commits    types.StringSlice  `gorm:"column:commits;<-;type:json" json:"commits"`
+	FinishedAt time.Time          `gorm:"column:finished_at;<-" json:"finished_at"`
+	PauseIDs   types.StringSlice  `gorm:"column:pause_ids;<-;type:json" json:"pause_ids"`
+}
diff --git a/internal/database/models/session_pause.go b/internal/database/models/session_pause.go
new file mode 100644
index 0000000..7808f93
--- /dev/null
+++ b/internal/database/models/session_pause.go
@@ -0,0 +1,13 @@
+package models
+
+import (
+	"time"
+)
+
+type SessionPause struct {
+	ID        uint      `gorm:"primaryKey" json:"id"`
+	ProjectID string    `gorm:"column:session_id;<-:create;type:uuid" json:"session_id"`
+	Resumed   bool      `gorm:"<-" json:"resumed"`
+	PausedAt  time.Time `gorm:"<-;autoCreateTime" json:"paused_at"`
+	ResumedAt time.Time `gorm:"<-" json:"resumed_at"`
+}
diff --git a/internal/database/models/sync_target.go b/internal/database/models/sync_target.go
new file mode 100644
index 0000000..b4735bd
--- /dev/null
+++ b/internal/database/models/sync_target.go
@@ -0,0 +1,8 @@
+package models
+
+type SyncTarget struct {
+	Base
+	Endpoint string    `gorm:"<-;type:string" json:"endpoint"`
+	Token    string    `gorm:"<-;type:string" json:"token"`
+	Included []Project `gorm:"many2many:synced_projects;"`
+}
diff --git a/internal/types/object_reference.go b/internal/types/object_reference.go
new file mode 100644
index 0000000..a3e2997
--- /dev/null
+++ b/internal/types/object_reference.go
@@ -0,0 +1,54 @@
+package types
+
+import (
+	"bytes"
+	"database/sql/driver"
+	"encoding/binary"
+	"fmt"
+)
+
+type ObjectReference struct {
+	ID   string
+	Kind ObjectType
+}
+
+func (or *ObjectReference) Scan(value any) error {
+	if value == nil {
+		*or = ObjectReference{ID: "", Kind: UndefinedObject}
+		return nil
+	}
+
+	switch v := value.(type) {
+	case string:
+		parts := bytes.Split([]byte(v), []byte{'-'})
+		if len(parts) != 2 {
+			return fmt.Errorf("invalid format for ObjectReference: %s", v)
+		}
+		id := string(parts[0])
+		kind, err := binary.ReadUvarint(bytes.NewReader(parts[1]))
+		if err != nil {
+			return err
+		}
+		or.ID = id
+		or.Kind = ObjectType(kind)
+		return nil
+
+	case []byte:
+		vStr := string(v)
+		return or.Scan(vStr)
+
+	default:
+		return fmt.Errorf("unexpected type for ObjectReference: %T", v)
+	}
+}
+
+func (or ObjectReference) Value() (driver.Value, error) {
+	if or.ID == "" {
+		return nil, nil
+	}
+	var kindBuf bytes.Buffer
+	if err := binary.Write(&kindBuf, binary.LittleEndian, int64(or.Kind)); err != nil {
+		return nil, err
+	}
+	return fmt.Sprintf("%s-%s", or.ID, kindBuf.Bytes()), nil
+}
diff --git a/internal/types/object_type.go b/internal/types/object_type.go
new file mode 100644
index 0000000..d327267
--- /dev/null
+++ b/internal/types/object_type.go
@@ -0,0 +1,44 @@
+package types
+
+import (
+	"database/sql/driver"
+	"fmt"
+)
+
+type ObjectType int
+
+const (
+	UndefinedObject ObjectType = iota
+	ProjectGroupObject
+	ProjectObject
+	SessionObject
+)
+
+var objectTypeNames = map[ObjectType]string{
+	ProjectGroupObject: "project group object",
+	ProjectObject:      "project object",
+	SessionObject:      "session object",
+}
+
+func (ot ObjectType) String() string {
+	return objectTypeNames[ot]
+}
+
+func (ot *ObjectType) Scan(value any) error {
+	if value == nil {
+		*ot = UndefinedObject
+		return nil
+	}
+
+	switch v := value.(type) {
+	case int64:
+		*ot = ObjectType(v)
+		return nil
+	default:
+		return fmt.Errorf("unexpected type for ObjectType: %T", v)
+	}
+}
+
+func (ot ObjectType) Value() (driver.Value, error) {
+	return int64(ot), nil
+}
diff --git a/internal/types/session_state.go b/internal/types/session_state.go
new file mode 100644
index 0000000..4158051
--- /dev/null
+++ b/internal/types/session_state.go
@@ -0,0 +1,43 @@
+package types
+
+import (
+	"database/sql/driver"
+	"fmt"
+)
+
+type SessionState int
+
+const (
+	StateActive SessionState = iota
+	StatePaused
+	StateFinished
+)
+
+var sessionStateNames = map[SessionState]string{
+	StateActive:   "active",
+	StatePaused:   "paused",
+	StateFinished: "finished",
+}
+
+func (ss SessionState) String() string {
+	return sessionStateNames[ss]
+}
+
+func (ss *SessionState) Scan(value any) error {
+	if value == nil {
+		*ss = StateActive
+		return nil
+	}
+
+	switch v := value.(type) {
+	case int64:
+		*ss = SessionState(v)
+		return nil
+	default:
+		return fmt.Errorf("unexpected type for SessionState: %T", v)
+	}
+}
+
+func (ss SessionState) Value() (driver.Value, error) {
+	return int64(ss), nil
+}
diff --git a/internal/types/string_slice.go b/internal/types/string_slice.go
new file mode 100644
index 0000000..0fd16bb
--- /dev/null
+++ b/internal/types/string_slice.go
@@ -0,0 +1,31 @@
+package types
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"errors"
+)
+
+type StringSlice []string
+
+func (s *StringSlice) Scan(value any) error {
+	bytes, ok := value.([]byte)
+	if !ok {
+		return errors.New("failed to unmarshal JSONB value")
+	}
+
+	result := StringSlice{}
+	if err := json.Unmarshal(bytes, &result); err != nil {
+		return err
+	}
+
+	*s = result
+	return nil
+}
+
+func (s StringSlice) Value() (driver.Value, error) {
+	if len(s) == 0 {
+		return nil, nil
+	}
+	return json.Marshal(s)
+}
diff --git a/internal/util/dir.go b/internal/util/dir.go
new file mode 100644
index 0000000..be95cec
--- /dev/null
+++ b/internal/util/dir.go
@@ -0,0 +1,23 @@
+package util
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+)
+
+// GetWorkDir returns the data directory for worktime
+func GetWorkDir() string {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		log.Fatalf("Failed to get user home directory: %v", err)
+	}
+
+	workDir := filepath.Join(homeDir, ".myworktime")
+
+	if err := os.MkdirAll(workDir, 0755); err != nil {
+		log.Fatalf("Failed to create worktime directory: %v", err)
+	}
+
+	return workDir
+}
diff --git a/internal/util/writer.go b/internal/util/writer.go
new file mode 100644
index 0000000..4ad5352
--- /dev/null
+++ b/internal/util/writer.go
@@ -0,0 +1,28 @@
+package util
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"git.zervo.org/zervo/worktime/internal/cli/color"
+)
+
+type ErrorWriter struct {
+	w     io.Writer
+	color string
+	reset string
+}
+
+func NewErrorWriter() *ErrorWriter {
+	return &ErrorWriter{
+		w:     os.Stderr,
+		color: color.Red,
+		reset: color.Reset,
+	}
+}
+
+func (ew *ErrorWriter) Write(p []byte) (n int, err error) {
+	colored := fmt.Appendf(nil, "%s%s%s", ew.color, p, ew.reset)
+	return ew.w.Write(colored)
+}