diff --git a/internal/config/config.go b/internal/config/config.go
new file mode 100644
index 0000000..5c08376
--- /dev/null
+++ b/internal/config/config.go
@@ -0,0 +1,40 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"sync"
+)
+
+type Config struct {
+	ListenAddr string
+	DataDir    string
+	DBPath     string
+	ReposDir   string
+}
+
+var instance *Config
+var initOnce sync.Once
+
+func Get() *Config {
+	initOnce.Do(func() {
+		instance = &Config{
+			ListenAddr: ":9000",
+			DataDir:    "./data",
+		}
+	})
+	return instance
+}
+
+func (c *Config) SetDataDir(dir string) {
+	c.DataDir = dir
+	c.DBPath = filepath.Join(dir, "gitm.db")
+	c.ReposDir = filepath.Join(dir, "repos")
+}
+
+func (c *Config) EnsureDirs() error {
+	if err := os.MkdirAll(c.DataDir, 0755); err != nil {
+		return err
+	}
+	return os.MkdirAll(c.ReposDir, 0755)
+}
diff --git a/internal/models/models.go b/internal/models/models.go
new file mode 100644
index 0000000..e757787
--- /dev/null
+++ b/internal/models/models.go
@@ -0,0 +1,42 @@
+package models
+
+import "time"
+
+type GiteaServer struct {
+	ID           int64      `json:"id"`
+	Name         string     `json:"name"`
+	URL          string     `json:"url"`
+	Token        string     `json:"-"` // Never expose in JSON
+	SyncInterval int        `json:"sync_interval"`
+	LastSyncAt   *time.Time `json:"last_sync_at"`
+	Status       string     `json:"status"`
+	CreatedAt    time.Time  `json:"created_at"`
+}
+
+type Repo struct {
+	ID         int64      `json:"id"`
+	ServerID   int64      `json:"server_id"`
+	Name       string     `json:"name"`
+	FullName   string     `json:"full_name"`
+	CloneURL   string     `json:"clone_url"`
+	LocalPath  string     `json:"local_path"`
+	Size       int64      `json:"size"`
+	LastSyncAt *time.Time `json:"last_sync_at"`
+	SyncStatus string     `json:"sync_status"`
+	CreatedAt  time.Time  `json:"created_at"`
+}
+
+type SyncLog struct {
+	ID         int64      `json:"id"`
+	ServerID   int64      `json:"server_id"`
+	RepoID     *int64     `json:"repo_id"`
+	Status     string     `json:"status"`
+	Message    string     `json:"message"`
+	StartedAt  time.Time  `json:"started_at"`
+	FinishedAt *time.Time `json:"finished_at"`
+}
+
+type Setting struct {
+	Key   string `json:"key"`
+	Value string `json:"value"`
+}