Refactor: Integrate backend API and normalize data

This commit integrates the backend API for fetching and updating report data. It also includes a normalization function to handle data consistency between the API and local storage.

Co-authored-by: anthonymuncher <anthonymuncher@gmail.com>

backend/app/models/classification/class_mapping.json

@@ -0,0 +1,8 @@
+{
+    "0": "broken_streetlight",
+    "1": "drainage",
+    "2": "garbage",
+    "3": "pothole",
+    "4": "signage",
+    "5": "streetlight"
+}

backend/app/models/ticket_model.py

@@ -0,0 +1,74 @@
+import uuid
+from sqlalchemy import Column, String, Float, Enum, DateTime, ForeignKey, Index
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from app.database import Base
+import enum
+
+# ----------------------
+# Enums
+# ----------------------
+class TicketStatus(str, enum.Enum):
+    NEW = "New"
+    IN_PROGRESS = "In Progress"
+    FIXED = "Fixed"
+
+class SeverityLevel(str, enum.Enum):
+    LOW = "Low"
+    MEDIUM = "Medium"
+    HIGH = "High"
+    NA = "N/A"
+
+# ----------------------
+# User Model
+# ----------------------
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()), index=True)
+    name = Column(String, nullable=False)
+    email = Column(String, unique=True, nullable=False)
+
+    tickets = relationship("Ticket", back_populates="user", cascade="all, delete-orphan")
+
+    def __repr__(self):
+        return f"<User(id={self.id}, name={self.name}, email={self.email})>"
+
+# ----------------------
+# Ticket Model
+# ----------------------
+class Ticket(Base):
+    __tablename__ = "tickets"
+
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()), index=True)
+    user_id = Column(String, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    image_path = Column(String, nullable=False)
+    category = Column(String, nullable=False)
+    severity = Column(Enum(SeverityLevel), nullable=False, default=SeverityLevel.NA)
+    description = Column(String, default="")
+    status = Column(Enum(TicketStatus), nullable=False, default=TicketStatus.NEW)
+    latitude = Column(Float, nullable=False)
+    longitude = Column(Float, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+    user = relationship("User", back_populates="tickets")
+
+    __table_args__ = (
+        Index("idx_category_status", "category", "status"),
+    )
+
+    def __repr__(self):
+        return f"<Ticket(id={self.id}, category={self.category}, severity={self.severity}, status={self.status}, user_id={self.user_id})>"
+
+# ----------------------
+# Ticket Audit Model
+# ----------------------
+class TicketAudit(Base):
+    __tablename__ = "ticket_audit"
+
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    ticket_id = Column(String, ForeignKey("tickets.id", ondelete="CASCADE"))
+    old_status = Column(Enum(TicketStatus))
+    new_status = Column(Enum(TicketStatus))
+    updated_at = Column(DateTime(timezone=True), server_default=func.now())