update

app/__init__.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from decimal import Decimal, InvalidOperation, ROUND_HALF_UP
+
+from flask import Flask
+
+from app.config import Config
+from app.extensions import db, migrate
+from app import models
+from app.routes.api import api_bp
+from app.routes.web import web_bp
+
+
+def _format_decimal(value: object, digits: int = 4) -> str:
+    if value is None:
+        return "-"
+
+    try:
+        decimal_value = Decimal(str(value))
+    except (InvalidOperation, ValueError, TypeError):
+        return str(value)
+
+    quantized = decimal_value.quantize(Decimal(f"1.{'0' * digits}"), rounding=ROUND_HALF_UP)
+    normalized = format(quantized, "f").rstrip("0").rstrip(".")
+    return normalized or "0"
+
+
+def create_app(config_object: type[Config] = Config) -> Flask:
+    app = Flask(__name__, instance_relative_config=True)
+    app.config.from_object(config_object)
+
+    db.init_app(app)
+    migrate.init_app(app, db)
+
+    app.register_blueprint(web_bp)
+    app.register_blueprint(api_bp)
+    app.jinja_env.filters["fmt_decimal"] = _format_decimal
+
+    return app