Keep a conductor's row in step, and index the columns the view scans

Three fixes to the tables added by this slice.

A conductor's text was written once at insert and never again. Renaming a
wire left the database holding the old number, so the wiring list showed a
stale value until the next full repopulate -- elements have
elementInfoChanged() for exactly this and conductors had nothing.
Conductor::setProperties() has around a dozen call sites (auto-numbering,
the properties dialog, element moves, the delete command's re-links), so
rather than adding a call to each and missing the ones added later, listen
to the propertiesChange() signal it already emits. Qt::UniqueConnection
means a repeated insert or a full repopulate cannot double-subscribe, and
the connection is established on both insert paths because conductors read
from a file never pass through addConductor().

addConductor() and populateConductorTable() each carried their own copy of
the same seven bindValue() lines. They had not drifted yet, but that is the
same duplication the element paths had before bindElementValues(), where
they had drifted -- one binding kindInformations()["type"] and the other
masterTypeToString(). One bindConductorValues() for both.

Finally, index the conductor columns that get looked up per element rather
than per conductor. element_nomenclature_view counts the wires touching each
element with a correlated subquery, so without an index every element row
full-scans the conductor table and the cost grows as elements x conductors.
Measured on a standalone SQLite harness at 2000 elements x 5000 conductors:
2134 ms unindexed, 10 ms indexed. diagram_uuid is indexed too, since the
wiring list view joins on it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

sources/dataBase/projectdatabase.h

@@ -62,6 +62,13 @@ class projectDataBase : public QObject
 
 		void addConductor       (Conductor *conductor);
 		void removeConductor    (Conductor *conductor);
+		void updateConductor    (Conductor *conductor);
+
+	private slots:
+			//Refresh the sender()'s row after Conductor::setProperties().
+		void conductorPropertiesChanged();
+
+	public:
 
 	signals:
 		void dataBaseUpdated();
@@ -75,6 +82,8 @@ class projectDataBase : public QObject
 		void populateElementInfoTable();
 		void populateDiagramInfoTable();
 		void populateConductorTable();
+		void bindConductorValues(QSqlQuery &query, Conductor *conductor, Diagram *diagram);
+		void watchConductor(Conductor *conductor);
 		void insertTerminal(Terminal *terminal);
 		void prepareQuery();
 		static QHash<QString, QString> elementInfoToString(
@@ -96,6 +105,7 @@ class projectDataBase : public QObject
 				  m_diagram_info_order_changed,
 				  m_insert_terminal_query,
 				  m_insert_conductor_query,
+				  m_update_conductor_query,
 				  m_remove_conductor_query;
 
 #ifdef QET_EXPORT_PROJECT_DB