feat: add api-based extension & external data tool & moderation backend (#1403)

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

api/models/api_based_extension.py

@@ -0,0 +1,27 @@
+import enum
+
+from sqlalchemy.dialects.postgresql import UUID
+
+from extensions.ext_database import db
+
+
+class APIBasedExtensionPoint(enum.Enum):
+    APP_EXTERNAL_DATA_TOOL_QUERY = 'app.external_data_tool.query'
+    PING = 'ping'
+    APP_MODERATION_INPUT = 'app.moderation.input'
+    APP_MODERATION_OUTPUT = 'app.moderation.output'
+
+
+class APIBasedExtension(db.Model):
+    __tablename__ = 'api_based_extensions'
+    __table_args__ = (
+        db.PrimaryKeyConstraint('id', name='api_based_extension_pkey'),
+        db.Index('api_based_extension_tenant_idx', 'tenant_id'),
+    )
+
+    id = db.Column(UUID, server_default=db.text('uuid_generate_v4()'))
+    tenant_id = db.Column(UUID, nullable=False)
+    name = db.Column(db.String(255), nullable=False)
+    api_endpoint = db.Column(db.String(255), nullable=False)
+    api_key = db.Column(db.Text, nullable=False)
+    created_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))