fix(preprocess): lease DWH generation reads

harness/tht/cli/search_cmd.py

@@ -21,8 +21,18 @@ DEFAULT_TOP_FALLBACK = 10
 search_app = typer.Typer(help="Ricerca semantica (evidence/schema/values) nel vectorstore")
 
 
+def _leased_dwh_snapshot(cfg, context: typer.Context):
+    from tht.jobs.dwh_pipeline import lease_dwh_snapshot
+
+    lease = lease_dwh_snapshot(cfg)
+    snapshot = lease.__enter__()
+    context.call_on_close(lambda: lease.__exit__(None, None, None))
+    return snapshot
+
+
 @search_app.command("find")
 def search_cmd(
+    ctx: typer.Context,
     keyword: str = typer.Argument(..., help="Termine da cercare, es. 'ablazione'."),
     config: Path = CONFIG_OPT,
     top: int | None = typer.Option(
@@ -47,9 +57,7 @@ def search_cmd(
     from tht.search import combined_search
 
     cfg = _load_config_or_exit(config)
-    from tht.jobs.dwh_pipeline import resolve_dwh_snapshot
-
-    dwh_snapshot = resolve_dwh_snapshot(cfg)
+    dwh_snapshot = _leased_dwh_snapshot(cfg, ctx)
     require_vector_cfg(cfg)
     from tht.search.evidence import active_searcher
 
@@ -225,6 +233,7 @@ PACK_EXCERPT_CHARS = 400
 
 @search_app.command("pack")
 def pack_cmd(
+    ctx: typer.Context,
     question: str = typer.Argument(..., help="La domanda in linguaggio naturale."),
     config: Path = CONFIG_OPT,
     session: str = typer.Option(
@@ -247,9 +256,7 @@ def pack_cmd(
     from tht.vectorstore.rest_client import VectorRestError
 
     cfg = _load_config_or_exit(config)
-    from tht.jobs.dwh_pipeline import resolve_dwh_snapshot
-
-    dwh_snapshot = resolve_dwh_snapshot(cfg)
+    dwh_snapshot = _leased_dwh_snapshot(cfg, ctx)
     require_vector_cfg(cfg)
 
     tables: list[dict] = []