refactor(core): route integrations through adapter factory

harness/tht/cli/sql_cmd.py

@@ -90,46 +90,18 @@ def validate_or_exit(cfg, sql: str, session_id: str | None):
     return result
 
 
-def _ro_engine(cfg):
-    """Engine sul target con search_path impostato allo schema (nomi non qualificati)."""
-    from sqlalchemy import create_engine
-
-    db = cfg.database
-    url = f"postgresql+psycopg2://{db.user}:{db.password}@{db.host}:{db.port}/{db.database}"
-    return create_engine(
-        url, echo=False,
-        connect_args={"options": f"-csearch_path={db.db_schema}"},
-    )
-
-
-def _rest_client(cfg):
-    from tht.rest.client import RestClient
-
-    return RestClient(cfg.rest)
-
-
 def do_explain(cfg, sql: str):
-    """EXPLAIN secondo il transport configurato (direct|rest)."""
-    if cfg.database.transport == "rest":
-        from tht.rest.execute import explain_rest
+    """EXPLAIN through the configured DWH adapter."""
+    from tht.adapters.factory import build_dwh
 
-        return explain_rest(_rest_client(cfg), sql)
-    from tht.execute import explain
-
-    return explain(_ro_engine(cfg), sql, timeout_ms=cfg.execution.statement_timeout_ms)
+    return build_dwh(cfg).explain(sql)
 
 
 def _run_transport(cfg, sql: str, *, limit: int):
-    """Dispatch all'esecutore controllato secondo il transport (direct|rest)."""
-    if cfg.database.transport == "rest":
-        from tht.rest.execute import run_controlled_rest
+    """Dispatch through the configured DWH adapter."""
+    from tht.adapters.factory import build_dwh
 
-        return run_controlled_rest(_rest_client(cfg), sql, limit=limit)
-    from tht.execute import run_controlled
-
-    return run_controlled(
-        _ro_engine(cfg), sql, limit=limit, timeout_ms=cfg.execution.statement_timeout_ms
-    )
+    return build_dwh(cfg).run_query(sql, limit=limit)
 
 
 def do_run(cfg, sql: str, *, limit: int, offset: int = 0):