feat: add marketplace metrics, privacy features, and service registry endpoints

- Add Prometheus metrics for marketplace API throughput and error rates with new dashboard panels
- Implement confidential transaction models with encryption support and access control
- Add key management system with registration, rotation, and audit logging
- Create services and registry routers for service discovery and management
- Integrate ZK proof generation for privacy-preserving receipts
- Add metrics instru

apps/coordinator-api/alembic/versions/2024_01_10_add_settlements_table.py

@@ -0,0 +1,75 @@
+"""Add settlements table for cross-chain settlements
+
+Revision ID: 2024_01_10_add_settlements_table
+Revises: 2024_01_05_add_receipts_table
+Create Date: 2025-01-10 10:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = '2024_01_10_add_settlements_table'
+down_revision = '2024_01_05_add_receipts_table'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Create settlements table
+    op.create_table(
+        'settlements',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('message_id', sa.String(length=255), nullable=False),
+        sa.Column('job_id', sa.String(length=255), nullable=False),
+        sa.Column('source_chain_id', sa.Integer(), nullable=False),
+        sa.Column('target_chain_id', sa.Integer(), nullable=False),
+        sa.Column('receipt_hash', sa.String(length=66), nullable=True),
+        sa.Column('proof_data', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+        sa.Column('payment_amount', sa.Numeric(precision=36, scale=18), nullable=True),
+        sa.Column('payment_token', sa.String(length=42), nullable=True),
+        sa.Column('nonce', sa.BigInteger(), nullable=False),
+        sa.Column('signature', sa.String(length=132), nullable=True),
+        sa.Column('bridge_name', sa.String(length=50), nullable=False),
+        sa.Column('status', sa.String(length=20), nullable=False),
+        sa.Column('transaction_hash', sa.String(length=66), nullable=True),
+        sa.Column('gas_used', sa.BigInteger(), nullable=True),
+        sa.Column('fee_paid', sa.Numeric(precision=36, scale=18), nullable=True),
+        sa.Column('error_message', sa.Text(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+        sa.Column('completed_at', sa.DateTime(timezone=True), nullable=True),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('message_id')
+    )
+    
+    # Create indexes
+    op.create_index('ix_settlements_job_id', 'settlements', ['job_id'])
+    op.create_index('ix_settlements_status', 'settlements', ['status'])
+    op.create_index('ix_settlements_bridge_name', 'settlements', ['bridge_name'])
+    op.create_index('ix_settlements_created_at', 'settlements', ['created_at'])
+    op.create_index('ix_settlements_message_id', 'settlements', ['message_id'])
+    
+    # Add foreign key constraint for jobs table
+    op.create_foreign_key(
+        'fk_settlements_job_id',
+        'settlements', 'jobs',
+        ['job_id'], ['id'],
+        ondelete='CASCADE'
+    )
+
+
+def downgrade():
+    # Drop foreign key
+    op.drop_constraint('fk_settlements_job_id', 'settlements', type_='foreignkey')
+    
+    # Drop indexes
+    op.drop_index('ix_settlements_message_id', table_name='settlements')
+    op.drop_index('ix_settlements_created_at', table_name='settlements')
+    op.drop_index('ix_settlements_bridge_name', table_name='settlements')
+    op.drop_index('ix_settlements_status', table_name='settlements')
+    op.drop_index('ix_settlements_job_id', table_name='settlements')
+    
+    # Drop table
+    op.drop_table('settlements')