src/wce_crm/backend/backend.py

@@ -24,6 +24,8 @@ from wce_crm.types import (
     ConsultingType,
     ContactPersonInfo,
     InitRecType,
+    LinkingConsultationsEntryCompany,
+    LinkingConsultationsEntryPerson,
     MainPageEntry,
 )
 
@@ -315,71 +317,6 @@ def initrec_person_from_db(
     )
 
 
-# def initrec_person_to_db(
-#     auto_form_data: Initrec,
-# ) -> Initrec_FromDb:
-#     logger.debug("[AutoForm -- backend] Call database saving routine...")
-
-#     dump_data = copy.deepcopy(auto_form_data.form_data)
-#     dump_data["geloescht"] = auto_form_data.geloescht
-
-#     return_from_db: Initrec_FromDb
-
-#     with db.ENGINE.begin() as conn:
-#         if auto_form_data.rec_id is None:
-#             # insert new "Vorgang"
-#             logger.debug("[AutoForm -- backend] Insert...")
-
-#             stmt = db.grunderfassung_personen.insert().returning(
-#                 db.grunderfassung_personen.c.pers_id,
-#                 db.grunderfassung_personen.c.Metadaten_aktualisierung,
-#                 db.grunderfassung_personen.c.geloescht,
-#             )
-#             ret = conn.execute(stmt, dump_data)
-#             if ret.rowcount == 0:
-#                 raise IOError("Entry was not inserted correctly")
-
-#             from_db = ret.mappings().fetchall()
-#             assert len(from_db) == 1, "expected excactly one returned row"
-#             data_from_db = from_db[0]
-#             return_from_db = Initrec_FromDb(
-#                 rec_id=data_from_db["un_id"],
-#                 geloescht=data_from_db["geloescht"],
-#                 Metadaten_aktualisierung=data_from_db["Metadaten_aktualisierung"],
-#             )
-
-#             logger.debug("[AutoForm -- backend] Inserted InitRec successfully")
-
-#         else:
-#             logger.debug("[AutoForm -- backend] Update...")
-#             stmt = (
-#                 db.beratung_vorgang.update()
-#                 .where(db.grunderfassung_personen.c.pers_id == auto_form_data.rec_id)
-#                 .returning(
-#                     db.grunderfassung_personen.c.Metadaten_aktualisierung,
-#                     db.grunderfassung_personen.c.geloescht,
-#                 )
-#             )
-#             ret = conn.execute(stmt, dump_data)
-
-#             from_db = ret.mappings().fetchall()
-#             assert len(from_db) == 1, "expected excatly one returned row"
-#             data_from_db = from_db[0]
-
-#             return_from_db = Initrec_FromDb(
-#                 rec_id=auto_form_data.rec_id,
-#                 geloescht=data_from_db["geloescht"],
-#                 Metadaten_aktualisierung=data_from_db["Metadaten_aktualisierung"],
-#             )
-
-#             logger.debug(
-#                 "[AutoForm -- backend] Updated InitRec with ID %d successfully",
-#                 auto_form_data.rec_id,
-#             )
-
-#     return return_from_db
-
-
 def initrec_company_get_initial_recording(
     id_: RecId,
 ) -> dict[str, Any]:
@@ -580,30 +517,6 @@ def page_consulting_delete(
             db.beratung_einzelberatung.c.geloescht.is_(None),
         )
         conn.execute(stmt, dump_data)
-        return
-
-        stmt = db.beratung_einzelberatung.select().where(
-            db.beratung_einzelberatung.c.vorgang_id == cons_id,
-            db.beratung_einzelberatung.c.geloescht.is_(None),
-        )
-        ret = conn.execute(stmt)
-        cons_sessions = ret.mappings().all()
-        # empty results possible
-        if not cons_sessions:
-            logger.debug("[Consulting Page] No sessions, return directly...")
-            return
-
-        rows_for_db_update: list[dict[str, Any]] = []
-        for row_data in cons_sessions:
-            row_data_dump = copy.deepcopy(dump_data)
-            row_data_dump["b_beratung_id"] = row_data["beratung_id"]
-            rows_for_db_update.append(row_data_dump)
-
-        if rows_for_db_update:
-            stmt = db.beratung_einzelberatung.update().where(
-                db.beratung_einzelberatung.c.beratung_id == sql.bindparam("b_beratung_id")
-            )
-            conn.execute(stmt, rows_for_db_update)
 
 
 @wrap_result(11)
@@ -682,6 +595,105 @@ def page_consulting_from_db(
 
 
 # // consulting page interaction
+def page_consulting_linking_companies(
+    un_id: RecId | None,
+) -> list[LinkingConsultationsEntryCompany]:
+    with db.ENGINE.connect() as conn:
+        q_relevant_companies = sql.select(
+            db.grunderfassung_unternehmen.c.un_id,
+            db.grunderfassung_unternehmen.c.Partnersuche__un_suche,
+        ).where(
+            db.grunderfassung_unternehmen.c.geloescht.is_(None),
+            db.grunderfassung_unternehmen.c.Partnersuche__un_suche.is_not(None),
+        )
+        if un_id is not None:
+            q_relevant_companies = q_relevant_companies.where(
+                db.grunderfassung_unternehmen.c.un_id == un_id
+            )
+
+        q_relevant_companies = q_relevant_companies.subquery("relevant_companies")
+
+        stmt = sql.select(
+            q_relevant_companies.c.un_id,
+            db.ext_crm_master_attach.c.ma_unternehmensname,
+        ).select_from(
+            q_relevant_companies.join(
+                db.ext_crm_master_attach,
+                q_relevant_companies.c.Partnersuche__un_suche
+                == db.ext_crm_master_attach.c.ma_id,
+            )
+        )
+
+        ret = conn.execute(stmt)
+        company_names = ret.mappings().all()
+        if not company_names:
+            raise ValueError(f"No companies found for 'un_id': {un_id}")
+
+    logger.debug("[Page Consulting -- Linking] Retrieved company names:\n%s", company_names)
+
+    linking_entries: list[LinkingConsultationsEntryCompany] = []
+    for entry in company_names:
+        linking_entries.append(
+            LinkingConsultationsEntryCompany(
+                un_id=entry["un_id"],
+                display_name=entry["ma_unternehmensname"],
+            )
+        )
+
+    return linking_entries
+
+
+def page_consulting_linking_persons(
+    un_id: RecId | None,
+) -> list[LinkingConsultationsEntryPerson]:
+    with db.ENGINE.connect() as conn:
+        # if un_id None: list all persons
+        # else: list just the persons associated with the company
+
+        person_select = sql.select(
+            db.grunderfassung_personen.c.pers_id,
+            db.grunderfassung_personen.c.Stammdaten__name,
+            db.grunderfassung_personen.c.Stammdaten__vorname,
+            db.grunderfassung_personen.c.Stammdaten__ort,
+        )
+
+        if un_id is not None:
+            person_select = person_select.select_from(
+                db.grunderfassung_personen.join(
+                    db.zuordnung_personen_unternehmen,
+                    db.grunderfassung_personen.c.pers_id
+                    == db.zuordnung_personen_unternehmen.c.pers_id,
+                )
+            ).where(db.zuordnung_personen_unternehmen.c.un_id == un_id)
+
+        ret = conn.execute(person_select)
+        person_names = ret.mappings().all()
+        if not person_names:
+            logger.warning(f"No persons found for 'un_id': {un_id}")
+            return []
+
+    logger.debug("[Page Consulting -- Linking] Retrieved person names:\n%s", person_names)
+
+    linking_entries: list[LinkingConsultationsEntryPerson] = []
+    for entry in person_names:
+        first_name = entry["Stammdaten__vorname"]
+        last_name = entry["Stammdaten__name"]
+        location_city = entry["Stammdaten__ort"]
+
+        display_name = f"{first_name} {last_name}"
+        if location_city:
+            display_name += f" (Ort: {location_city})"
+
+        linking_entries.append(
+            LinkingConsultationsEntryPerson(
+                pers_id=entry["pers_id"],
+                display_name=display_name,
+            )
+        )
+
+    return linking_entries
+
+
 def companyprofile_page_get_consultations(
     un_id: RecId,
 ) -> CompanyProfileConsultations:

src/wce_crm/data_models.py

@@ -266,6 +266,14 @@ class Page_Consulting_State(PageState[Module]):
     locked: bool
 
 
+@dc.dataclass(slots=True, kw_only=True)
+class Page_Consulting_Linking_State(PageState[Module]):
+    session: Session
+    un_id: RecId | None = None
+    pers_id: RecId | None = None
+    beratungs_typ: ConsultingType
+
+
 @dc.dataclass(slots=True, kw_only=True)
 class Page_Consulting_ConsultingSession_State(PageState[Module]):
     session: Session

src/wce_crm/db.py

@@ -7,7 +7,7 @@ from pathlib import Path
 
 import polars as pl
 import sqlalchemy as sql
-from sqlalchemy import Column, String, Table, TypeDecorator
+from sqlalchemy import Column, String, Table, TypeDecorator, event
 
 from wce_crm import constants
 from wce_crm import types as t
@@ -63,6 +63,14 @@ MD_MAIN = sql.MetaData()
 ENGINE = sql.create_engine(f"sqlite:///{constants.Config.DB_PATH_MAIN}")
 
 
+@event.listens_for(ENGINE, "connect")
+def attach_second_db(dbapi_connection, connection_record):
+    cursor = dbapi_connection.cursor()
+    # 'kontaktliste' is the alias for the second DB
+    cursor.execute(f"ATTACH DATABASE '{constants.Config.DB_PATH_CRM}' AS kontaktliste")
+    cursor.close()
+
+
 ext_crm_master: sql.Table = Table(
     "Master",
     MD_CRM,
@@ -247,6 +255,37 @@ def get_ext_crm_contact_person(
 # df_contact_person = get_ext_crm_contact_person(None)
 DF_CONTACT_PERSON = get_ext_crm_contact_person(constants.Config.DB_PATH_CRM)
 
+ext_crm_master_attach: sql.Table = Table(
+    "Master",
+    MD_CRM,
+    Column("ma_id", sql.Integer, nullable=False, unique=True),
+    Column("wce_id", sql.ForeignKey("Nutzer.wce_id")),
+    Column("ma_unternehmensname", sql.Text, nullable=True),
+    Column("ma_branche", sql.Text, nullable=True),
+    Column("ma_strasse", sql.Text, nullable=True),
+    Column("ma_hausnummer", sql.Text, nullable=True),
+    Column("ma_plz", sql.Text, nullable=True),
+    Column("ma_ort", sql.Text, nullable=True),
+    Column("ma_plz_postfach", sql.Text, nullable=True),
+    Column("ma_postfach", sql.Text, nullable=True),
+    Column("ma_website", sql.Text, nullable=True),
+    Column("ma_mail", sql.Text, nullable=True),
+    Column("ma_telefonnummer", sql.Text, nullable=True),
+    Column("ma_faxnummer", sql.Text, nullable=True),
+    Column("ma_ersteintrag_datum", SafeDateTime, nullable=True),
+    Column("ma_aktualisierung_datum", SafeDateTime, nullable=True),
+    Column("ma_aktualisierung_nutzer", sql.Text, nullable=True),
+    Column("ma_sollprozess", sql.Text, nullable=True),
+    Column("ma_auslaendische_mitarbeiter", sql.Text, nullable=True),
+    Column("ma_quelle_information", sql.Text, nullable=True),
+    Column("ma_bemerkung", sql.Text, nullable=True),
+    Column("ma_kontakt", sql.Boolean, nullable=True),
+    Column("ma_schlagworte", sql.Text, nullable=True),
+    Column("ma_archiviert", sql.Boolean, nullable=True, default=False),
+    schema="kontaktliste",
+)
+
+
 grunderfassung_unternehmen: sql.Table = Table(
     "grunderfassung_unternehmen",
     MD_MAIN,

src/wce_crm/gui.py

@@ -51,6 +51,8 @@ from PySide6.QtWidgets import (
     QComboBox,
     QCompleter,
     QDateEdit,
+    QDialog,
+    QDialogButtonBox,
     QFormLayout,
     QFrame,
     QGridLayout,
@@ -60,6 +62,8 @@ from PySide6.QtWidgets import (
     QLabel,
     QLayout,
     QLineEdit,
+    QListWidget,
+    QListWidgetItem,
     QMainWindow,
     QMessageBox,
     QPlainTextEdit,
@@ -89,6 +93,7 @@ from wce_crm.data_models import (
     Initrec,
     Page_CompanyProfile_State,
     Page_Consulting_ConsultingSession_State,
+    Page_Consulting_Linking_State,
     Page_Consulting_State,
     Page_Consulting_Table_State,
     Page_InitRecCompany_State,
@@ -115,8 +120,17 @@ from wce_crm.logging import (
 from wce_crm.types import CompanyProfileConsultationEntry, ConsultingType, RecId
 
 if TYPE_CHECKING:
-    from wce_crm.data_models import AutoForm_State, Module, WrapperModule
-    from wce_crm.types import ConsId, ExtMaId
+    from wce_crm.data_models import (
+        AutoForm_State,
+        Module,
+        WrapperModule,
+    )
+    from wce_crm.types import (
+        ConsId,
+        ExtMaId,
+        LinkingConsultationsEntryCompany,
+        LinkingConsultationsEntryPerson,
+    )
 
 K = TypeVar("K")
 V = TypeVar("V")
@@ -2973,6 +2987,7 @@ class Page_InitRecCompany(QWidget):
     back_requested = Signal()  # back button
     update_main_page = Signal()  # form saved (data changed for front page)
     company_profile_requested = Signal(Page_CompanyProfile_State)
+    initrec_person_requested = Signal(Page_InitRecPerson_State)  # TODO add corresponding call
 
     def __init__(
         self,
@@ -3021,12 +3036,20 @@ class Page_InitRecCompany(QWidget):
         )
         self.comp_profile_btn.setFixedHeight(50)
 
+        self.initrec_person_btn = QPushButton("Individualperson erfassen")
+        self.initrec_person_btn.clicked.connect(self._request_inirec_person)
+        self.initrec_person_btn.setSizePolicy(
+            QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Fixed
+        )
+        self.initrec_person_btn.setFixedHeight(50)
+
         header_layout.setSpacing(5)
         header_layout.addWidget(back_btn_step)
         header_layout.addWidget(back_btn_main)
         header_layout.addWidget(title)
         header_layout.addSpacing(15)
         header_layout.addWidget(self.comp_profile_btn)
+        header_layout.addWidget(self.initrec_person_btn)
         vert_layout.addWidget(header_container)
 
         # --- BANNER ---
@@ -3119,6 +3142,18 @@ class Page_InitRecCompany(QWidget):
         logger_gui.debug("[Page -- InitRec Company] State to call: %s", req_state)
         self.company_profile_requested.emit(req_state)
 
+    def _request_inirec_person(self) -> None:
+        assert self.STATE.un_id is not None, (
+            "requested initrec of person for a company which is not known (no ID)"
+        )
+        req_state = Page_InitRecPerson_State(
+            session=self.STATE.session,
+            pers_id=None,
+            locked=False,
+        )
+        logger_gui.debug("[Page -- InitRec Company] State to call: %s", req_state)
+        self.initrec_person_requested.emit(req_state)
+
     def reset(self) -> None:
         self.auto_form.reset_form()
 
@@ -4088,6 +4123,13 @@ class Page_Consulting(QWidget):
             db_index_layout.addWidget(db_index_set_button)
             container_layout.addLayout(db_index_layout)
 
+            linking_button = QPushButton("Verlinkungsdialog öffnen")
+            linking_button.setSizePolicy(
+                QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Preferred
+            )
+            linking_button.clicked.connect(self._open_linking_dialogue)
+            container_layout.addWidget(linking_button)
+
             separator2 = QFrame()
             separator2.setFrameShape(QFrame.Shape.HLine)
             separator2.setFrameShadow(QFrame.Shadow.Sunken)
@@ -4264,6 +4306,34 @@ class Page_Consulting(QWidget):
     def _open_linking_dialogue(self) -> None:
         logger_page_consulting.info("[Consulting Page] Linking dialogue triggered")
 
+        # Dialog erstellen und anzeigen
+        dialog_state = Page_Consulting_Linking_State(
+            session=self.STATE.session,
+            un_id=self.STATE.un_id,
+            pers_id=self.STATE.pers_id,
+            beratungs_typ=self.STATE.beratungs_typ,
+        )
+        dialog = Page_Consulting_LinkingDialog(dialog_state, parent=self)
+
+        # .exec() öffnet das Fenster modal (blockiert das Hauptfenster)
+        if dialog.exec() == QDialog.DialogCode.Accepted:
+            # Hier hast du am Ende beide (oder nur eine) Entitäten auswertbar vorliegen:
+            firma = dialog.gewaehltes_unternehmen
+            person = dialog.gewaehlte_person
+
+            comp_name = firma["name"] if firma else "Keine"
+            person_name = person["name"] if person else "Keine"
+            logger_page_consulting.info(
+                "[Consulting Page] Firme gewählt: %s, Person gewählt: %s",
+                comp_name,
+                person_name,
+            )
+
+            # 1. TODO: Datenbank-Update ausführen (Fremdschlüssel setzen)
+            # 2. Banner ausblenden: self.banner.hide()
+        else:
+            logger_page_consulting.info("[Consulting Page] Verknüpfung abgebrochen.")
+
     def _clear_info_banners(self) -> None:
         while self.info_banners:
             banner = self.info_banners[0]
@@ -4663,6 +4733,265 @@ class Page_Consulting(QWidget):
         self._sync_state_to_GUI("locking")
 
 
+class Page_Consulting_LinkingDialog(QDialog):
+    def __init__(
+        self,
+        state: Page_Consulting_Linking_State,
+        parent: QWidget | None = None,
+    ):
+        super().__init__(parent)
+        self.STATE = state
+
+        self.setWindowTitle("Beziehung verknüpfen")
+        self.resize(700, 450)
+
+        # firmen_aus_db = [{"id": 1, "name": "Siemens AG"}, {"id": 2, "name": "Bosch GmbH"}]
+        # personen_aus_db = [
+        #     {
+        #         "id": 50,
+        #         "name": "Max Mustermann",
+        #         "unternehmen_id": 1,
+        #         "firma_name": "Siemens AG",
+        #     },
+        #     {
+        #         "id": 51,
+        #         "name": "Erika Muster",
+        #         "unternehmen_id": 1,
+        #         "firma_name": "Siemens AG",
+        #     },
+        #     {
+        #         "id": 52,
+        #         "name": "Peter Müller",
+        #         "unternehmen_id": 2,
+        #         "firma_name": "Bosch GmbH",
+        #     },
+        #     {
+        #         "id": 53,
+        #         "name": "Freiberufler Frank",
+        #         "unternehmen_id": None,
+        #         "firma_name": None,
+        #     },
+        # ]
+
+        # self.all_unternehmen = firmen_aus_db
+        # self.all_personen = personen_aus_db
+
+        # # Rückgabewerte
+        # self.gewaehltes_unternehmen = None
+        # self.gewaehlte_person = None
+
+        # --- UI LAYOUT ---
+        main_layout = QVBoxLayout(self)
+        column_layout = QHBoxLayout()
+
+        # left column: companies
+        self.vbox_companies = QVBoxLayout()
+        self.vbox_companies.addWidget(QLabel("<b>Unternehmen wählen (Optional):</b>"))
+        self.btn_clear_company = QPushButton("Auswahl aufheben")
+        self.list_companies = QListWidget()
+        self.vbox_companies.addWidget(self.list_companies)
+        self.vbox_companies.addWidget(self.btn_clear_company)
+
+        # right column: persons
+        self.vbox_persons = QVBoxLayout()
+        self.vbox_persons.addWidget(QLabel("<b>Person wählen (Optional):</b>"))
+        self.btn_clear_person = QPushButton("Auswahl aufheben")
+        self.list_persons = QListWidget()
+        self.vbox_persons.addWidget(self.list_persons)
+        self.vbox_persons.addWidget(self.btn_clear_person)
+
+        column_layout.addLayout(self.vbox_companies)
+        column_layout.addLayout(self.vbox_persons)
+        main_layout.addLayout(column_layout)
+
+        # Unten: OK / Abbrechen Buttons
+        self.button_box = QDialogButtonBox(
+            QDialogButtonBox.StandardButton.Ok | QDialogButtonBox.StandardButton.Cancel
+        )
+        self.ok_btn = self.button_box.button(QDialogButtonBox.StandardButton.Ok)
+        self.ok_btn.setText("Verknüpfung speichern")
+        self.ok_btn.setEnabled(False)
+        self.button_box.button(QDialogButtonBox.StandardButton.Cancel).setText("Abbrechen")
+        main_layout.addWidget(self.button_box)
+
+        # initial loading
+        # self._load_companies()
+        # self._load_persons()
+
+        # list_style = """
+        #     QListWidget::item:selected {
+        #         background-color: #0078D4;  /* Blau, wenn die Liste aktiv fokussiert ist */
+        #         color: white;
+        #     }
+        #     QListWidget::item:selected:!active {
+        #         background-color: #CCE4F7;  /* Gut sichtbares Hellblau, wenn die Liste den Fokus verliert */
+        #         color: black;
+        #     }
+        #     QListWidget::item:hover {
+        #         background-color: #F0F0F0;  /* Dezentes Grau beim Drüberfahren */
+        #     }
+        # """
+        # self.list_companies.setStyleSheet(list_style)
+        # self.list_persons.setStyleSheet(list_style)
+
+        # signals
+        self.list_companies.itemSelectionChanged.connect(self._company_selected)
+        self.list_persons.itemSelectionChanged.connect(self._person_selected)
+
+        self.btn_clear_company.clicked.connect(self._clear_company_selection)
+        self.btn_clear_person.clicked.connect(self._clear_person_selection)
+
+        self.button_box.accepted.connect(self.accept)
+        self.button_box.rejected.connect(self.reject)
+
+        self._sync_state_to_GUI(reset=True)
+
+    def _enable_person_selection(
+        self,
+        enable: bool,
+    ) -> None:
+        logger_page_consulting.debug(">>>>>>> CALL ENABLE: %s", enable)
+        for i in range(self.vbox_persons.count()):
+            item = self.vbox_persons.itemAt(i)
+            if not item:
+                continue
+            widget = item.widget()
+            logger_page_consulting.debug(">>>>>>> Type widget: %s", type(widget))
+            if isinstance(widget, QWidget):
+                logger_page_consulting.debug(">>>>>>> Widget (enable=%s): %s", enable, widget)
+                widget.setEnabled(enable)
+
+    def _reset(self) -> None:
+        self._clear_company_selection()
+        self._clear_person_selection()
+
+    def _sync_state_to_GUI(
+        self,
+        reset: bool,
+        section: Literal["person_selection", "validation"] | None = None,
+    ) -> None:
+        if reset:
+            self._reset()
+            self._load_companies()
+
+        if section is None or section == "person_selection":
+            if self.STATE.beratungs_typ is ConsultingType.PAUSCHAL:
+                self._enable_person_selection(False)
+            elif self.STATE.beratungs_typ is ConsultingType.INDIVIDUAL:
+                self._enable_person_selection(True)
+                self.list_persons.blockSignals(True)
+                self._load_persons(self.STATE.un_id)
+                self.list_persons.blockSignals(False)
+
+        if section is None or section == "validation":
+            self._validate()
+
+    def _validate(self) -> None:
+        valid: bool = False
+
+        if self.STATE.beratungs_typ is ConsultingType.PAUSCHAL:
+            assert self.STATE.pers_id is None
+            if self.STATE.un_id is not None:
+                valid = True
+        elif self.STATE.beratungs_typ is ConsultingType.INDIVIDUAL:
+            if self.STATE.pers_id is not None:
+                valid = True
+        else:
+            RuntimeError("Undefined consulting type")
+
+        if valid:
+            self.ok_btn.setEnabled(True)
+        else:
+            self.ok_btn.setEnabled(False)
+
+    def _load_companies(self) -> None:
+        self.list_companies.clear()
+        companies = backend.page_consulting_linking_companies(un_id=self.STATE.un_id)
+        logger_page_consulting.debug(
+            "[Page Consulting -- Linking] Retrieved company entries:\n%s", companies
+        )
+
+        for company in companies:
+            item = QListWidgetItem(company.display_name)
+            item.setData(Qt.ItemDataRole.UserRole, company)
+            self.list_companies.addItem(item)
+
+    def _load_persons(
+        self,
+        un_id: RecId | None,
+    ) -> None:
+        """Lädt Personen. Wenn firma_id übergeben wird, wird gefiltert."""
+        self.list_persons.clear()
+
+        persons = backend.page_consulting_linking_persons(un_id)
+        logger_page_consulting.debug(
+            "[Page Consulting -- Linking] Retrieved person entries:\n%s", persons
+        )
+
+        for person in persons:
+            item = QListWidgetItem(person.display_name)
+            item.setData(Qt.ItemDataRole.UserRole, person)
+            self.list_persons.addItem(item)
+
+    # --- LOGIK ---
+    def _company_selected(self) -> None:
+        items = self.list_companies.selectedItems()
+        if not items:
+            return
+
+        company = cast(
+            "LinkingConsultationsEntryCompany", items[0].data(Qt.ItemDataRole.UserRole)
+        )
+        self.STATE.un_id = company.un_id
+
+        logger_page_consulting.debug(
+            "[Page Consulting -- Linking] Company selected. State is:\n%s",
+            pformat(self.STATE),
+        )
+        self._sync_state_to_GUI(reset=False)
+        # if self.STATE.beratungs_typ is ConsultingType.INDIVIDUAL:
+        #     self.list_persons.blockSignals(True)
+        #     self._load_persons(un_id=self.STATE.un_id)
+        #     self.list_persons.blockSignals(False)
+
+    def _person_selected(self) -> None:
+        items = self.list_persons.selectedItems()
+        if not items:
+            return
+
+        person = cast(
+            "LinkingConsultationsEntryPerson", items[0].data(Qt.ItemDataRole.UserRole)
+        )
+        self.STATE.pers_id = person.pers_id
+        self._sync_state_to_GUI(reset=False, section="validation")
+
+        # TODO this backlink is a really good idea and should be implemented
+        # if person["unternehmen_id"]:
+        #     self.list_companies.blockSignals(True)
+        #
+        #     for i in range(self.list_companies.count()):
+        #         item = self.list_companies.item(i)
+        #         firma_data = item.data(Qt.ItemDataRole.UserRole)
+        #         if firma_data["id"] == person["unternehmen_id"]:
+        #             item.setSelected(True)
+        #             self.gewaehltes_unternehmen = firma_data
+        #             break
+        #     self.list_companies.blockSignals(False)
+
+    def _clear_company_selection(self) -> None:
+        self.list_companies.clearSelection()
+        self.STATE.un_id = None
+        self._sync_state_to_GUI(reset=False)
+
+    def _clear_person_selection(self) -> None:
+        self.list_persons.clearSelection()
+        self.STATE.pers_id = None
+        self._sync_state_to_GUI(reset=False)
+
+    def get_state(self) -> Page_Consulting_Linking_State:
+        return self.STATE
+
+
 class Page_Consulting_ConsultingSession(QWidget):
     """child of 'Page_Consulting_DynamicTable'"""
 
@@ -5461,6 +5790,7 @@ class MainWindow(QMainWindow):
         self.initrec_company.back_main_requested.connect(self.show_main_page)
         self.initrec_company.back_requested.connect(self.show_new_entry_select)
         self.initrec_company.update_main_page.connect(self.update_grid)
+        self.initrec_company.initrec_person_requested.connect(self.show_page_initrec_person)
         self.initrec_company.company_profile_requested.connect(self.show_page_company_profile)
         self.stack.addWidget(self.initrec_company)
         # SITE: 'Grunderfassung Person'

src/wce_crm/types.py

@@ -103,3 +103,15 @@ class CompanyProfileConsultationEntry:
 class CompanyProfileConsultations:
     pauschal: list[CompanyProfileConsultationEntry]
     individual: list[CompanyProfileConsultationEntry]
+
+
+@dc.dataclass(slots=True)
+class LinkingConsultationsEntryCompany:
+    un_id: RecId
+    display_name: str
+
+
+@dc.dataclass(slots=True)
+class LinkingConsultationsEntryPerson:
+    pers_id: RecId
+    display_name: str