diff --git a/codex-lens/src/codexlens/cli/commands.py b/codex-lens/src/codexlens/cli/commands.py
index 166237d2..4fe396b1 100644
--- a/codex-lens/src/codexlens/cli/commands.py
+++ b/codex-lens/src/codexlens/cli/commands.py
@@ -248,12 +248,6 @@ def init(
         else:
             console.print(f"[red]Init failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Init failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
     finally:
         if registry is not None:
             registry.close()
@@ -457,12 +451,6 @@ def search(
         else:
             console.print(f"[red]Search failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Search failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
     finally:
         if registry is not None:
             registry.close()
@@ -522,12 +510,6 @@ def symbol(
         else:
             console.print(f"[red]Symbol lookup failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Symbol lookup failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
     finally:
         if registry is not None:
             registry.close()
@@ -583,12 +565,6 @@ def inspect(
         else:
             console.print(f"[red]Inspect failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Inspect failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
 
 
 @app.command()
@@ -727,12 +703,6 @@ def status(
         else:
             console.print(f"[red]Status failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Status failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
     finally:
         if registry is not None:
             registry.close()
@@ -884,12 +854,6 @@ def projects(
         else:
             console.print(f"[red]Projects command failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Projects command failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
     finally:
         if registry is not None:
             registry.close()
@@ -1060,12 +1024,6 @@ def config(
         else:
             console.print(f"[red]Config command failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Config command failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
 
 
 @app.command()
@@ -1192,12 +1150,6 @@ def migrate(
         else:
             console.print(f"[red]Migration failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Migration failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
     finally:
         if registry is not None:
             registry.close()
@@ -1346,12 +1298,6 @@ def clean(
         else:
             console.print(f"[red]Clean failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Clean failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
 
 
 @app.command("semantic-list")
@@ -1472,12 +1418,6 @@ def semantic_list(
         else:
             console.print(f"[red]Semantic-list failed:[/red] {exc}")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=f"Unexpected error: {exc}")
-        else:
-            console.print(f"[red]Semantic-list failed (unexpected):[/red] {exc}")
-            raise typer.Exit(code=1)
     finally:
         if registry is not None:
             registry.close()
@@ -1549,12 +1489,6 @@ def model_list(
             console.print("[red]Error:[/red] fastembed not installed")
             console.print("[yellow]Install with:[/yellow] pip install codexlens[semantic]")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=str(exc))
-        else:
-            console.print(f"[red]Model-list failed:[/red] {exc}")
-            raise typer.Exit(code=1)
 
 
 @app.command(name="model-download")
@@ -1600,12 +1534,6 @@ def model_download(
             console.print("[red]Error:[/red] fastembed not installed")
             console.print("[yellow]Install with:[/yellow] pip install codexlens[semantic]")
             raise typer.Exit(code=1)
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=str(exc))
-        else:
-            console.print(f"[red]Model-download failed:[/red] {exc}")
-            raise typer.Exit(code=1)
 
 
 @app.command(name="model-delete")
@@ -1639,13 +1567,6 @@ def model_delete(
             console.print(f"  Model: {data['model_name']}")
             console.print(f"  Freed space: {data['deleted_size_mb']:.1f} MB")
 
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=str(exc))
-        else:
-            console.print(f"[red]Model-delete failed:[/red] {exc}")
-            raise typer.Exit(code=1)
-
 
 @app.command(name="model-info")
 def model_info(
@@ -1682,13 +1603,6 @@ def model_info(
             console.print(f"\n  Description: {data['description']}")
             console.print(f"  Use case: {data['use_case']}")
 
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=str(exc))
-        else:
-            console.print(f"[red]Model-info failed:[/red] {exc}")
-            raise typer.Exit(code=1)
-
 
 # ==================== Embedding Management Commands ====================
 
@@ -1821,13 +1735,6 @@ def embeddings_status(
                     console.print("\n[dim]Generate embeddings with:[/dim]")
                     console.print(f"  [cyan]codexlens embeddings-generate {index_path}[/cyan]")
 
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=str(exc))
-        else:
-            console.print(f"[red]Embeddings-status failed:[/red] {exc}")
-            raise typer.Exit(code=1)
-
 
 @app.command(name="embeddings-generate")
 def embeddings_generate(
@@ -2011,10 +1918,3 @@ def embeddings_generate(
 
             console.print("\n[dim]Use vector search with:[/dim]")
             console.print("  [cyan]codexlens search 'your query' --mode pure-vector[/cyan]")
-
-    except Exception as exc:
-        if json_mode:
-            print_json(success=False, error=str(exc))
-        else:
-            console.print(f"[red]Embeddings-generate failed:[/red] {exc}")
-            raise typer.Exit(code=1)
diff --git a/codex-lens/src/codexlens/config.py b/codex-lens/src/codexlens/config.py
index fb96c74d..953b6ac7 100644
--- a/codex-lens/src/codexlens/config.py
+++ b/codex-lens/src/codexlens/config.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import os
 from dataclasses import dataclass, field
+from functools import cached_property
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
@@ -96,17 +97,17 @@ class Config:
         except Exception as exc:
             raise ConfigError(f"Failed to initialize data_dir at {self.data_dir}: {exc}") from exc
 
-    @property
+    @cached_property
     def cache_dir(self) -> Path:
         """Directory for transient caches."""
         return self.data_dir / "cache"
 
-    @property
+    @cached_property
     def index_dir(self) -> Path:
         """Directory where index artifacts are stored."""
         return self.data_dir / "index"
 
-    @property
+    @cached_property
     def db_path(self) -> Path:
         """Default SQLite index path."""
         return self.index_dir / "codexlens.db"
diff --git a/codex-lens/src/codexlens/entities.py b/codex-lens/src/codexlens/entities.py
index a69edfa1..08e51f54 100644
--- a/codex-lens/src/codexlens/entities.py
+++ b/codex-lens/src/codexlens/entities.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from enum import Enum
 from typing import Any, Dict, List, Optional, Tuple
 
 from pydantic import BaseModel, Field, field_validator
@@ -62,24 +63,23 @@ class IndexedFile(BaseModel):
         return cleaned
 
 
+class RelationshipType(str, Enum):
+    """Types of code relationships."""
+    CALL = "call"
+    INHERITS = "inherits"
+    IMPORTS = "imports"
+
+
 class CodeRelationship(BaseModel):
     """A relationship between code symbols (e.g., function calls, inheritance)."""
 
     source_symbol: str = Field(..., min_length=1, description="Name of source symbol")
     target_symbol: str = Field(..., min_length=1, description="Name of target symbol")
-    relationship_type: str = Field(..., min_length=1, description="Type of relationship (call, inherits, etc.)")
+    relationship_type: RelationshipType = Field(..., description="Type of relationship (call, inherits, etc.)")
     source_file: str = Field(..., min_length=1, description="File path containing source symbol")
     target_file: Optional[str] = Field(default=None, description="File path containing target (None if same file)")
     source_line: int = Field(..., ge=1, description="Line number where relationship occurs (1-based)")
 
-    @field_validator("relationship_type")
-    @classmethod
-    def validate_relationship_type(cls, value: str) -> str:
-        allowed_types = {"call", "inherits", "imports"}
-        if value not in allowed_types:
-            raise ValueError(f"relationship_type must be one of {allowed_types}")
-        return value
-
 
 class AdditionalLocation(BaseModel):
     """A pointer to another location where a similar result was found.