Implement comprehensive CSV import system for legacy database migration

- Added 5 new legacy models to app/models.py (FileType, FileNots, RolexV, FVarLkup, RVarLkup)
- Created app/import_legacy.py with import functions for all legacy tables:
  * Reference tables: TRNSTYPE, TRNSLKUP, FOOTERS, FILESTAT, EMPLOYEE, GRUPLKUP, FILETYPE, FVARLKUP, RVARLKUP
  * Core tables: ROLODEX, PHONE, ROLEX_V, FILES, FILES_R, FILES_V, FILENOTS, LEDGER, DEPOSITS, PAYMENTS
  * Specialized: PLANINFO, QDROS, PENSIONS and all pension-related tables
- Created app/sync_legacy_to_modern.py with sync functions to populate modern models from legacy data
- Updated admin routes in app/main.py:
  * Extended process_csv_import to support all new import types
  * Added /admin/sync endpoint for syncing legacy to modern models
  * Updated get_import_type_from_filename to recognize all CSV file patterns
- Enhanced app/templates/admin.html with:
  * Import Order Guide showing recommended import sequence
  * Sync to Modern Models section with confirmation dialog
  * Sync results display with detailed per-table statistics
  * Updated supported file formats list
- All import functions use batch processing (500 rows), proper error handling, and structured logging
- Sync functions maintain foreign key integrity and skip orphaned records with warnings

app/models.py

@@ -683,3 +683,68 @@ class PensionSeparate(Base):
     __table_args__ = (
         ForeignKeyConstraint(["file_no", "version"], ["pensions.file_no", "pensions.version"], ondelete="CASCADE"),
     )
+
+
+class FileType(Base):
+    """FILETYPE reference table for file/case types."""
+    __tablename__ = "filetype"
+
+    file_type = Column(String, primary_key=True)
+
+    def __repr__(self):
+        return f"<FileType(file_type='{self.file_type}')>"
+
+
+class FileNots(Base):
+    """FILENOTS table for file memos/notes."""
+    __tablename__ = "filenots"
+
+    file_no = Column(String, ForeignKey("files.file_no", ondelete="CASCADE"), primary_key=True)
+    memo_date = Column(Date, primary_key=True)
+    memo_note = Column(Text)
+
+    __table_args__ = (
+        Index("ix_filenots_file_no", "file_no"),
+    )
+
+    def __repr__(self):
+        return f"<FileNots(file_no='{self.file_no}', date='{self.memo_date}')>"
+
+
+class RolexV(Base):
+    """ROLEX_V variables per rolodex entry."""
+    __tablename__ = "rolex_v"
+
+    id = Column(String, ForeignKey("rolodex.id", ondelete="CASCADE"), primary_key=True)
+    identifier = Column(String, primary_key=True)
+    response = Column(Text)
+
+    __table_args__ = (
+        Index("ix_rolex_v_id", "id"),
+    )
+
+    def __repr__(self):
+        return f"<RolexV(id='{self.id}', identifier='{self.identifier}')>"
+
+
+class FVarLkup(Base):
+    """FVARLKUP file variable lookup table."""
+    __tablename__ = "fvarlkup"
+
+    identifier = Column(String, primary_key=True)
+    query = Column(Text)
+    response = Column(Text)
+
+    def __repr__(self):
+        return f"<FVarLkup(identifier='{self.identifier}')>"
+
+
+class RVarLkup(Base):
+    """RVARLKUP rolodex variable lookup table."""
+    __tablename__ = "rvarlkup"
+
+    identifier = Column(String, primary_key=True)
+    query = Column(Text)
+
+    def __repr__(self):
+        return f"<RVarLkup(identifier='{self.identifier}')>"