- Add Settings menu for Stripe configuration- In the Member Profile page, Superadmin can assign new Role to the member- Stripe Configuration is now stored with encryption in Database

models.py

@@ -137,6 +137,10 @@ class User(Base):
     wordpress_user_id = Column(BigInteger, nullable=True, comment="Original WordPress user ID")
     wordpress_registered_date = Column(DateTime(timezone=True), nullable=True, comment="Original WordPress registration date")
 
+    # Role Change Audit Trail
+    role_changed_at = Column(DateTime(timezone=True), nullable=True, comment="Timestamp when role was last changed")
+    role_changed_by = Column(UUID(as_uuid=True), ForeignKey('users.id', ondelete='SET NULL'), nullable=True, comment="Admin who changed the role")
+
     created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
     updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
 
@@ -145,6 +149,7 @@ class User(Base):
     events_created = relationship("Event", back_populates="creator")
     rsvps = relationship("EventRSVP", back_populates="user")
     subscriptions = relationship("Subscription", back_populates="user", foreign_keys="Subscription.user_id")
+    role_changer = relationship("User", foreign_keys=[role_changed_by], remote_side="User.id", post_update=True)
 
 class Event(Base):
     __tablename__ = "events"
@@ -509,3 +514,36 @@ class ImportRollbackAudit(Base):
     # Relationships
     import_job = relationship("ImportJob")
     admin_user = relationship("User", foreign_keys=[rolled_back_by])
+
+
+# ============================================================
+# System Settings Models
+# ============================================================
+
+class SettingType(enum.Enum):
+    plaintext = "plaintext"
+    encrypted = "encrypted"
+    json = "json"
+
+
+class SystemSettings(Base):
+    """System-wide configuration settings stored in database"""
+    __tablename__ = "system_settings"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    setting_key = Column(String(100), unique=True, nullable=False, index=True)
+    setting_value = Column(Text, nullable=True)
+    setting_type = Column(SQLEnum(SettingType), default=SettingType.plaintext, nullable=False)
+    description = Column(Text, nullable=True)
+    updated_by = Column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), nullable=False)
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc), nullable=False)
+    is_sensitive = Column(Boolean, default=False, nullable=False)
+
+    # Relationships
+    updater = relationship("User", foreign_keys=[updated_by])
+
+    # Index on updated_at for audit queries
+    __table_args__ = (
+        Index('idx_system_settings_updated_at', 'updated_at'),
+    )