feat: consolidate database management work

Add catalog-owned logical relationships and runtime snapshots, extend the database-management UI and validation coverage, and document the updated operational workflow.

Keep active sensitive-generation status in a tooltip and indicator, and update the layout E2E to follow the history action in its new database-scoped location.

harness/tht/cli/search_cmd.py

@@ -231,8 +231,7 @@ def search_cmd(
             )
 
     if kind == "schema":
-        from tht.cli.schema_cmd import annotations_path
-        from tht.mschema.models import Annotations, PhysicalSchema
+        from tht.mschema.context import SchemaContextError, load_schema_context
         from tht.mschema.render import to_mschema_text
         from tht.search import schema_tables
 
@@ -243,6 +242,11 @@ def search_cmd(
                 fg=typer.colors.RED, err=True,
             )
             raise typer.Exit(code=1)
+        try:
+            schema_context = load_schema_context(cfg, physical_file=phys_file)
+        except SchemaContextError as exc:
+            typer.secho(f"ERRORE: {exc}", fg=typer.colors.RED, err=True)
+            raise typer.Exit(code=1) from None
 
         candidates = combined_search(
             keyword=keyword, lsh_hits=lsh_hits,
@@ -258,10 +262,13 @@ def search_cmd(
             typer.secho(f"Nessuna tabella candidata per '{keyword}'.", fg=typer.colors.YELLOW)
             return
 
-        physical = PhysicalSchema.from_yaml(phys_file)
-        annotations = Annotations.from_yaml(annotations_path(cfg))
         selected = [t for t, _ in ranked]
-        mschema = to_mschema_text(physical, annotations, tables=selected)
+        mschema = to_mschema_text(
+            schema_context.physical,
+            schema_context.annotations,
+            tables=selected,
+            effective_relationships=schema_context.effective_relationships,
+        )
 
         if json_out:
             typer.echo(json.dumps(