Still making little progress fixing my stray engine problem.

crudkit/core/service.py

@@ -132,8 +132,19 @@ class CRUDService(Generic[T]):
         self._session_factory = session_factory
         self.polymorphic = polymorphic
         self.supports_soft_delete = hasattr(model, 'is_deleted')
-        # Cache backend info once. If not provided, derive from session bind.
+
-        bind = session_factory().get_bind()
+        # Derive engine WITHOUT leaking a session/connection
+        bind = getattr(session_factory, "bind", None)
+        if bind is None:
+            tmp_sess = session_factory()
+            try:
+                bind = tmp_sess.get_bind()
+            finally:
+                try:
+                    tmp_sess.close()
+                except Exception:
+                    pass
+
         eng: Engine = bind.engine if isinstance(bind, Connection) else cast(Engine, bind)
         self.backend = backend or make_backend_info(eng)
 
@@ -147,6 +158,14 @@ class CRUDService(Generic[T]):
             return self.session.query(poly), poly
         return self.session.query(self.model), self.model
 
+    def _debug_bind(self, where: str):
+        try:
+            bind = self.session.get_bind()
+            eng = getattr(bind, "engine", bind)
+            print(f"SERVICE BIND [{where}]: engine_id={id(eng)} url={getattr(eng, 'url', '?')} session={type(self.session).__name__}")
+        except Exception as e:
+            print(f"SERVICE BIND [{where}]: failed to introspect bind: {e}")
+
     def _apply_not_deleted(self, query, root_alias, params) -> Any:
         if self.supports_soft_delete and not _is_truthy((params or {}).get("include_deleted")):
             return query.filter(getattr(root_alias, "is_deleted") == False)
@@ -224,6 +243,7 @@ class CRUDService(Generic[T]):
           - forward/backward seek via `key` and `backward`
         Returns a SeekWindow with items, first/last keys, order spec, limit, and optional total.
         """
+        self._debug_bind("seek_window")
         session = self.session
         query, root_alias = self.get_query()
 
@@ -455,6 +475,7 @@ class CRUDService(Generic[T]):
 
     def get(self, id: int, params=None) -> T | None:
         """Fetch a single row by id with conflict-free eager loading and clean projection."""
+        self._debug_bind("get")
         query, root_alias = self.get_query()
 
         # Defaults so we can build a projection even if params is None
@@ -549,6 +570,7 @@ class CRUDService(Generic[T]):
 
     def list(self, params=None) -> list[T]:
         """Offset/limit listing with smart relationship loading and clean projection."""
+        self._debug_bind("list")
         query, root_alias = self.get_query()
 
         # Defaults so we can reference them later even if params is None

crudkit/integrations/flask.py

@@ -1,20 +1,58 @@
+# crudkit/integrations/flask.py
 from __future__ import annotations
 from flask import Flask
-from sqlalchemy.orm import scoped_session
+from sqlalchemy.orm import scoped_session, sessionmaker
 from ..engines import CRUDKitRuntime
 from ..config import Config
 
-def init_app(app: Flask, *, runtime: CRUDKitRuntime | None = None, config: type[Config] | None == None):
+def init_app(app: Flask, *, runtime: CRUDKitRuntime | None = None, config: type[Config] | None = None):
     """
-    Initializes CRUDKit for a Flask app. Provies `app.extensions['crudkit']`
+    Initializes CRUDKit for a Flask app. Provides `app.extensions['crudkit']`
     with a runtime (engine + session_factory). Caller manages session lifecycle.
     """
     runtime = runtime or CRUDKitRuntime(config=config)
     app.extensions.setdefault("crudkit", {})
     app.extensions["crudkit"]["runtime"] = runtime
 
-    Session = runtime.session_factory
+    # Build ONE sessionmaker bound to the ONE true engine object
-    if Session is not None:
+    # so engine id == sessionmaker.bind id, always.
-        app.extensions["crudkit"]["Session"] = scoped_session(Session)
+    engine = runtime.engine
+    SessionFactory = runtime.session_factory or sessionmaker(bind=engine, **runtime._config.session_kwargs())
+    app.extensions["crudkit"]["SessionFactory"] = SessionFactory
+    app.extensions["crudkit"]["Session"] = scoped_session(SessionFactory)
+
+    # Attach pool listeners to the *same* engine the SessionFactory is bound to.
+    # Don’t guess. Don’t hope. Inspect.
+    try:
+        bound_engine = getattr(SessionFactory, "bind", None) or getattr(SessionFactory, "kw", {}).get("bind") or engine
+        pool = bound_engine.pool
+
+        from sqlalchemy import event
+
+        @event.listens_for(pool, "checkout")
+        def _on_checkout(dbapi_conn, conn_record, conn_proxy):
+            sz = pool.size()
+            chk = pool.checkedout()
+            try:
+                conns_in_pool = pool.checkedin()
+            except Exception:
+                conns_in_pool = "?"
+            print(f"POOL CHECKOUT: Pool size: {sz}  Connections in pool: {conns_in_pool} "
+                  f"Current Overflow: {pool.overflow()} Current Checked out connections: {chk} "
+                  f"engine id= {id(bound_engine)}")
+
+        @event.listens_for(pool, "checkin")
+        def _on_checkin(dbapi_conn, conn_record):
+            sz = pool.size()
+            chk = pool.checkedout()
+            try:
+                conns_in_pool = pool.checkedin()
+            except Exception:
+                conns_in_pool = "?"
+            print(f"POOL CHECKIN: Pool size: {sz}  Connections in pool: {conns_in_pool} "
+                  f"Current Overflow: {pool.overflow()} Current Checked out connections: {chk} "
+                  f"engine id= {id(bound_engine)}")
+    except Exception as e:
+        print(f"[crudkit.init_app] Failed to attach pool listeners: {e}")
 
     return runtime

inventory/__init__.py

@@ -1,6 +1,9 @@
 from __future__ import annotations
 
 from flask import Flask
+from sqlalchemy.engine import Engine
+from sqlalchemy import event
+from sqlalchemy.pool import Pool
 
 import crudkit
 
@@ -12,12 +15,45 @@ from .routes.index import init_index_routes
 from .routes.listing import init_listing_routes
 from .routes.entry import init_entry_routes
 
+def _bind_pool_debug(engine):
+    pool = engine.pool
+    eid = id(engine)
+
+    @event.listens_for(pool, "checkout")
+    def _on_checkout(dbapi_con, con_record, con_proxy):
+        try:
+            print(f"POOL CHECKOUT: {pool.status()} engine id= {eid}")
+        except Exception:
+            # pool.status is safe on SQLA 2.x, but let's be defensive
+            print(f"POOL CHECKOUT (no status) engine id= {eid}")
+
+    @event.listens_for(pool, "checkin")
+    def _on_checkin(dbapi_con, con_record):
+        try:
+            print(f"POOL CHECKIN: {pool.status()} engine id= {eid}")
+        except Exception:
+            print(f"POOL CHECKIN (no status) engine id= {eid}")
+
 def create_app(config_cls=crudkit.DevConfig) -> Flask:
     app = Flask(__name__)
 
     init_pretty(app)
 
     runtime = init_app(app, config=crudkit.ProdConfig)
+    from sqlalchemy import event
+
+    engine = runtime.engine
+    print(f"CRUDKit engine id={id(runtime.engine)} url={runtime.engine.url}")
+    _bind_pool_debug(runtime.engine)   # ← attach to the real engine’s pool
+
+    # quick status endpoint you can hit while clicking around
+    @app.get("/_db_status")
+    def _db_status():
+        try:
+            return {"pool": engine.pool.status()}
+        except Exception as e:
+            return {"error": str(e)}, 500
+
     crudkit.init_crud(app)
     print(f"Effective DB URL: {str(runtime.engine.url)}")
 
@@ -25,12 +61,18 @@ def create_app(config_cls=crudkit.DevConfig) -> Flask:
     from .routes.reports import bp_reports
     _models.Base.metadata.create_all(bind=runtime.engine)
 
+    # ensure extensions carries the scoped_session from integrations.init_app
     Session = app.extensions["crudkit"].get("Session")
-    if Session is None:
+    if Session is not None:
-        SessionFactory = runtime.session_factory
+        # tell crud layer to use it for any future services
-        Session = SessionFactory
+        if hasattr(crudkit, "crud") and hasattr(crudkit.crud, "configure_session_factory"):
-
+            crudkit.crud.configure_session_factory(Session)
-    session = Session
+        # patch any services already created before this point
+        try:
+            for svc in getattr(crudkit.crud, "_services", {}).values():
+                svc._session_factory = Session
+        except Exception:
+            pass
 
     crudkit.crud.register_many([
         _models.Area,
@@ -54,7 +96,10 @@ def create_app(config_cls=crudkit.DevConfig) -> Flask:
     @app.teardown_appcontext
     def _remove_session(_exc):
         sess = app.extensions["crudkit"].get("Session")
-        if sess is not None:
+        if hasattr(sess, "remove"):
-            sess.remove()
+            try:
+                sess.remove()
+            except Exception:
+                pass
 
     return app

inventory/db.py

@@ -12,6 +12,7 @@ _engine = None
 SessionLocal = None
 
 def init_db(database_url: str, engine_kwargs: Dict[str, Any], session_kwargs: Dict[str, Any]) -> None:
+    print("AM I EVEN BEING RUN?!")
     global _engine, SessionLocal
     print(database_url)
     _engine = create_engine(database_url, **engine_kwargs)

inventory/routes/entry.py

@@ -1,8 +1,6 @@
-from flask import Blueprint, render_template, abort, request, jsonify
+from flask import Blueprint, render_template, abort, request, jsonify, current_app
 
 import crudkit
-
-from crudkit.api._cursor import decode_cursor, encode_cursor
 from crudkit.ui.fragments import render_form
 
 bp_entry = Blueprint("entry", __name__)
@@ -12,34 +10,31 @@ def init_entry_routes(app):
     @bp_entry.get("/entry/<model>/<int:id>")
     def entry(model: str, id: int):
         cls = crudkit.crud.get_model(model)
-        if cls is None:
+        if cls is None or model not in ["inventory", "worklog", "user"]:
-            abort(404)
-        if model not in ["inventory", "worklog", "user"]:
             abort(404)
 
         fields = {}
         fields_spec = []
         layout = []
+
         if model == "inventory":
-            fields["fields"] = ["label", "name", "serial", "barcode", "brand", "model", "device_type", "owner", "location", "condition", "image", "notes"]
+            fields["fields"] = ["label", "name", "serial", "barcode", "brand", "model",
+                                "device_type", "owner", "location", "condition", "image", "notes"]
             fields_spec = [
                 {"name": "label", "type": "display", "label": "", "row": "label",
                  "attrs": {"class": "display-6 mb-3"}},
-
                 {"name": "name", "row": "names", "label": "Name", "wrap": {"class": "col-3"},
                  "attrs": {"class": "form-control"}, "label_attrs": {"class": "form-label"}},
                 {"name": "serial", "row": "names", "label": "Serial #", "wrap": {"class": "col"},
                  "attrs": {"class": "form-control"}, "label_attrs": {"class": "form-label"}},
                 {"name": "barcode", "row": "names", "label": "Barcode #", "wrap": {"class": "col"},
                  "attrs": {"class": "form-control"}, "label_attrs": {"class": "form-label"}},
-
                 {"name": "brand", "label_spec": "{name}", "row": "device", "wrap": {"class": "col"},
                  "attrs": {"class": "form-control"}, "label": "Brand", "label_attrs": {"class": "form-label"}},
-                {"name": "model", "row": "device", "wrap": {"class": "col"}, "attrs": {"class": "form-control"},
+                {"name": "model", "row": "device", "wrap": {"class": "col"},
-                 "label": "Model #", "label_attrs": {"class": "form-label"}},
+                 "attrs": {"class": "form-control"}, "label": "Model #", "label_attrs": {"class": "form-label"}},
                 {"name": "device_type", "label_spec": "{description}", "row": "device", "wrap": {"class": "col"},
                  "attrs": {"class": "form-control"}, "label": "Device Type", "label_attrs": {"class": "form-label"}},
-
                 {"name": "owner", "row": "status", "label": "Contact", "wrap": {"class": "col"},
                  "attrs": {"class": "form-control"}, "label_attrs": {"class": "form-label"},
                  "label_spec": "{label}"},
@@ -48,13 +43,12 @@ def init_entry_routes(app):
                  "label_spec": "{name} - {room_function.description}"},
                 {"name": "condition", "row": "status", "label": "Condition", "wrap": {"class": "col"},
                  "attrs": {"class": "form-control"}, "label_attrs": {"class": "form-label"}},
-
                 {"name": "image", "label": "", "row": "image", "type": "template", "label_spec": "{filename}",
                  "template": "image_display.html", "attrs": {"class": "img-fluid img-thumbnail h-auto"},
                  "wrap": {"class": "h-100 w-100"}},
-
                 {"name": "notes", "type": "textarea", "label": "Notes", "row": "notes", "wrap": {"class": "col"},
-                 "attrs": {"class": "form-control", "rows": 10, "style": "resize: none;"}, "label_attrs": {"class": "form-label"}},
+                 "attrs": {"class": "form-control", "rows": 10, "style": "resize: none;"},
+                 "label_attrs": {"class": "form-label"}},
             ]
             layout = [
                 {"name": "label", "order": 5},
@@ -66,85 +60,79 @@ def init_entry_routes(app):
                 {"name": "notes", "order": 45, "attrs": {"class": "row mt-2"}, "parent": "everything"},
                 {"name": "image", "order": 50, "attrs": {"class": "col-4"}, "parent": "kitchen_sink"},
             ]
+
         elif model.lower() == 'user':
             fields["fields"] = ["label", "first_name", "last_name", "title", "active", "staff", "location", "supervisor"]
             fields_spec = [
                 {"name": "label", "row": "label", "label": "", "type": "display",
                  "attrs": {"class": "display-6 mb-3"}},
-
                 {"name": "last_name", "label": "Last Name", "label_attrs": {"class": "form-label"},
-                 "attrs": {"placeholder": "Doe", "class": "form-control"},
+                 "attrs": {"placeholder": "Doe", "class": "form-control"}, "row": "name", "wrap": {"class": "col-3"}},
-                 "row": "name", "wrap": {"class": "col-3"}},
-
                 {"name": "first_name", "label": "First Name", "label_attrs": {"class": "form-label"},
-                 "attrs": {"placeholder": "John", "class": "form-control"},
+                 "attrs": {"placeholder": "John", "class": "form-control"}, "row": "name", "wrap": {"class": "col-3"}},
-                 "row": "name", "wrap": {"class": "col-3"}},
-
                 {"name": "title", "label": "Title", "label_attrs": {"class": "form-label"},
                  "attrs": {"placeholder": "President of the Universe", "class": "form-control"},
                  "row": "name", "wrap": {"class": "col-3"}},
-
                 {"name": "supervisor", "label": "Supervisor", "label_attrs": {"class": "form-label"},
                  "label_spec": "{label}", "row": "details", "wrap": {"class": "col-3"},
                  "attrs": {"class": "form-control"}},
-
                 {"name": "location", "label": "Room", "label_attrs": {"class": "form-label"},
                  "label_spec": "{name} - {room_function.description}",
                  "row": "details", "wrap": {"class": "col-3"}, "attrs": {"class": "form-control"}},
-
                 {"name": "active", "label": "Active", "label_attrs": {"class": "form-check-label"},
                  "row": "checkboxes", "attrs": {"class": "form-check-input"}, "wrap": {"class": "form-check"}},
-
                 {"name": "staff", "label": "Staff Member", "label_attrs": {"class": "form-check-label"},
-                 "row": "checkboxes", "attrs": {"class": "form-check-input"}, "wrap": {"class": "form-check"}}
+                 "row": "checkboxes", "attrs": {"class": "form-check-input"}, "wrap": {"class": "form-check"}},
             ]
             layout = [
                 {"name": "label", "order": 0},
                 {"name": "name", "order": 10, "attrs": {"class": "row"}},
                 {"name": "details", "order": 20, "attrs": {"class": "row mt-2"}},
-                {"name": "checkboxes", "order": 30, "parent": "name", "attrs": {"class": "col d-flex flex-column justify-content-end"}}
+                {"name": "checkboxes", "order": 30, "parent": "name",
+                 "attrs": {"class": "col d-flex flex-column justify-content-end"}},
             ]
+
         elif model == "worklog":
             fields["fields"] = ["id", "contact", "work_item", "start_time", "end_time", "complete"]
             fields_spec = [
                 {"name": "id", "label": "", "type": "display", "label_spec": "Work Item #{id}",
                  "attrs": {"class": "display-6 mb-3"}, "row": "label"},
-
                 {"name": "contact", "row": "ownership", "wrap": {"class": "col"}, "label": "Contact",
-                 "label_spec": "{label}", "attrs": {"class": "form-control"},
+                 "label_spec": "{label}", "attrs": {"class": "form-control"}, "label_attrs": {"class": "form-label"}},
-                 "label_attrs": {"class": "form-label"}},
                 {"name": "work_item", "row": "ownership", "wrap": {"class": "col"}, "label": "Work Item",
                  "label_spec": "{label}", "attrs": {"class": "form-control"}, "label_attrs": {"class": "form-label"}},
-
                 {"name": "start_time", "type": "datetime", "attrs": {"class": "form-control"}, "row": "timestamps",
                  "wrap": {"class": "col"}, "label_attrs": {"class": "form-label"}, "label": "Start"},
                 {"name": "end_time", "type": "datetime", "attrs": {"class": "form-control"}, "row": "timestamps",
                  "wrap": {"class": "col"}, "label_attrs": {"class": "form-label"}, "label": "End"},
                 {"name": "complete", "label": "Complete", "label_attrs": {"class": "form-check-label"},
                  "attrs": {"class": "form-check-input"}, "row": "timestamps", "wrap": {"class": "col form-check"}},
-
                 {"name": "updates", "label": "Updates", "row": "updates", "label_attrs": {"class": "form-label"},
-                 "type": "template", "template": "update_list.html"}
+                 "type": "template", "template": "update_list.html"},
             ]
             layout = [
                 {"name": "label", "order": 0},
                 {"name": "ownership", "order": 10, "attrs": {"class": "row mb-2"}},
                 {"name": "timestamps", "order": 20, "attrs": {"class": "row d-flex align-items-center"}},
-                {"name": "updates", "order": 30, "attrs": {"class": "row"}}
+                {"name": "updates", "order": 30, "attrs": {"class": "row"}},
             ]
 
-        obj = crudkit.crud.get_service(cls).get(id, fields)
+        svc = crudkit.crud.get_service(cls)
+        obj = svc.get(id, fields)
         if obj is None:
             abort(404)
 
+        # Use the scoped_session proxy so teardown .remove() cleans it up
+        ScopedSession = current_app.extensions["crudkit"]["Session"]
+
         form = render_form(
             cls,
             obj.as_dict(),
-            crudkit.crud.get_service(cls).session,
+            session=ScopedSession,         # ← fixed: pass scoped proxy, not svc.session
             instance=obj,
             fields_spec=fields_spec,
             layout=layout,
-            submit_attrs={"class": "btn btn-primary mt-3"}
+            submit_attrs={"class": "btn btn-primary mt-3"},
         )
         return render_template("entry.html", form=form)
 

inventory/routes/listing.py

@@ -107,6 +107,30 @@ def init_listing_routes(app):
             spec["sort"] = sort
 
         service = crudkit.crud.get_service(cls)
+        try:
+            rt = app.extensions["crudkit"]["runtime"]
+            rt_engine = rt.engine
+        except Exception:
+            rt_engine = None
+
+        try:
+            SessionFactory = app.extensions["crudkit"].get("SessionFactory")
+            sf_engine = getattr(SessionFactory, "bind", None) or getattr(SessionFactory, "kw", {}).get("bind")
+        except Exception:
+            sf_engine = None
+
+        try:
+            bind = service.session.get_bind()
+            svc_engine = getattr(bind, "engine", bind)
+        except Exception:
+            svc_engine = None
+
+        print(
+            "LISTING ENGINES: "
+            f"runtime={id(rt_engine) if rt_engine else None}  "
+            f"session_factory.bind={id(sf_engine) if sf_engine else None}  "
+            f"service.bind={id(svc_engine) if svc_engine else None}"
+        )
         # include limit and go
         window = service.seek_window(spec | {"limit": limit}, key=key, backward=backward, include_total=True)