diff --git a/src/repocat/models/catalog.py b/src/repocat/models/catalog.py
new file mode 100644
index 0000000..e5958d8
--- /dev/null
+++ b/src/repocat/models/catalog.py
@@ -0,0 +1,118 @@
+from __future__ import annotations
+from pathlib import Path
+from datetime import datetime
+from typing import Optional, List
+from pydantic import BaseModel, Field
+import shutil
+
+from repocat.models.config import RepoCategory, RepoCatConfig
+from repocat.utils.fsutils import get_dir_size, is_git_dirty, is_git_unpushed
+
+
+class GitStatus(BaseModel):
+    dirty: bool
+    unpushed: bool
+    branch: Optional[str] = None
+    remote_url: Optional[str] = None
+
+    @property
+    def is_protected(self) -> bool:
+        return self.dirty or self.unpushed
+
+
+class RepoModel(BaseModel):
+    name: str
+    path: Path
+    size_bytes: int
+    last_modified: datetime
+    git: Optional[GitStatus] = None
+
+    @property
+    def size_mb(self) -> float:
+        return self.size_bytes / 1024 / 1024
+
+    @property
+    def age_days(self) -> int:
+        return (datetime.now() - self.last_modified).days
+
+    @property
+    def is_git_repo(self) -> bool:
+        return self.git is not None
+
+    def is_expired(self, days: int) -> bool:
+        return self.age_days >= days
+
+    def move_to(self, target_dir: Path) -> None:
+        destination = target_dir / self.name
+        if destination.exists():
+            raise FileExistsError(f"Zielordner existiert bereits: {destination}")
+        shutil.move(str(self.path), str(destination))
+        self.path = destination
+
+
+class RepoCategoryState(BaseModel):
+    config: RepoCategory
+    path: Path
+    repos: List[RepoModel] = Field(default_factory=list)
+
+    def total_size_mb(self) -> float:
+        return sum(repo.size_mb for repo in self.repos)
+
+    def find_repo(self, name: str) -> Optional[RepoModel]:
+        return next((r for r in self.repos if r.name == name), None)
+
+
+class RepoCatalogState(BaseModel):
+    config: RepoCatConfig
+    categories: List[RepoCategoryState] = Field(default_factory=list)
+
+    @classmethod
+    def from_config(cls, config: RepoCatConfig) -> RepoCatalogState:
+        categories: List[RepoCategoryState] = []
+
+        for cat_cfg in config.categories:
+            cat_path = config.base_dir / cat_cfg.subdir
+            repos: List[RepoModel] = []
+
+            if cat_path.exists():
+                for item in sorted(cat_path.iterdir()):
+                    if not item.is_dir():
+                        continue
+
+                    last_mod = datetime.fromtimestamp(item.stat().st_mtime)
+                    size = get_dir_size(item)
+
+                    git = None
+                    if (item / ".git").exists():
+                        git = GitStatus(
+                            dirty=is_git_dirty(item),
+                            unpushed=is_git_unpushed(item),
+                        )
+
+                    repos.append(RepoModel(
+                        name=item.name,
+                        path=item,
+                        size_bytes=size,
+                        last_modified=last_mod,
+                        git=git,
+                    ))
+
+            categories.append(RepoCategoryState(
+                config=cat_cfg,
+                path=cat_path,
+                repos=repos,
+            ))
+
+        return cls(config=config, categories=categories)
+
+    def get_category(self, name: str) -> Optional[RepoCategoryState]:
+        return next((c for c in self.categories if c.config.name == name), None)
+
+    def find_repo(self, name: str) -> Optional[RepoModel]:
+        for cat in self.categories:
+            if (repo := cat.find_repo(name)):
+                return repo
+        return None
+
+    def missing_directories(self) -> List[Path]:
+        return [cat.path for cat in self.categories if not cat.path.exists()]
diff --git a/src/repocat/utils/fsutils.py b/src/repocat/utils/fsutils.py
new file mode 100644
index 0000000..df07b79
--- /dev/null
+++ b/src/repocat/utils/fsutils.py
@@ -0,0 +1,43 @@
+import subprocess
+from pathlib import Path
+
+def get_dir_size(path: Path) -> int:
+    """Returns directory size in bytes."""
+    return sum(f.stat().st_size for f in path.rglob("*") if f.is_file())
+
+def is_git_dirty(path: Path) -> bool:
+    """Returns True if there are uncommitted changes."""
+    try:
+        result = subprocess.run(
+            ["git", "status", "--porcelain"],
+            cwd=path,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.DEVNULL,
+            text=True,
+        )
+        return bool(result.stdout.strip())
+    except Exception:
+        return False
+
+def is_git_unpushed(path: Path) -> bool:
+    """Returns True if there are commits that haven't been pushed to upstream."""
+    try:
+        # Check if upstream exists
+        subprocess.run(
+            ["git", "rev-parse", "--abbrev-ref", "--symbolic-full-name", "@{u}"],
+            cwd=path,
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL,
+            check=True,
+        )
+
+        result = subprocess.run(
+            ["git", "log", "@{u}..HEAD", "--oneline"],
+            cwd=path,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.DEVNULL,
+            text=True,
+        )
+        return bool(result.stdout.strip())
+    except Exception:
+        return False
\ No newline at end of file