feat: implement configuration and database session setup for NeonDB and Redis

backend/app/config/settings.py

@@ -1 +1,40 @@
-#
+from pydantic_settings import BaseSettings, SettingsConfigDict
+from pydantic import Field
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str= "QuantIQ"
+    API_V1_STR: str= "/api/v1"
+    
+    # Required environment variables (must be present in your .env file)
+    DATABASE_URL: str
+    REDIS_URL: str
+    GEMINI_API_KEY: str
+    
+    # Optional Razorpay Credentials (defaults to empty string if not set)
+    RAZORPAY_KEY_ID: str= Field(default="")
+    RAZORPAY_KEY_SECRET: str= Field(default="")
+    RAZORPAY_WEBHOOK_SECRET: str= Field(default="")
+    
+    # Auth configuration
+    SECRET_KEY: str= Field(default="supersecretkeychangeinproduction")
+    ACCESS_TOKEN_EXPIRE_MINUTES: int= 60*24*8 
+    
+    @property
+    def database_url_async(self) -> str:
+        """
+        Ensures the database URL uses the asyncpg driver dialect.
+        Converts 'postgresql://' to 'postgresql+asyncpg://'
+        """
+        url= self.DATABASE_URL
+        if url.startswith("postgresql://"):
+            return url.replace("postgresql://", "postgresql+asyncpg://", 1)
+        return url
+    
+    model_config= SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        case_sensitive=True,
+        extra="ignore"
+    )
+
+settings= Settings()

backend/app/database/session.py

@@ -1 +1,31 @@
-#
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
+from sqlalchemy.orm import DeclarativeBase
+from backend.app.config.settings import settings
+
+# Create async engine for Postgres using the resolved async URL
+engine= create_async_engine(
+    settings.database_url_async,
+    echo= False,
+    future= True
+)
+
+# Create session factory
+SessionLocal= async_sessionmaker(
+    bind= engine,
+    autocommit= False,
+    autoflush= False,
+    expire_on_commit= False,
+    class_= AsyncSession
+)
+
+# Declarative base for SQLAlchemy models
+class Base(DeclarativeBase):
+    pass
+
+# Dependency to retrieve a database session for requests
+async def get_db():
+    async with SessionLocal() as session:
+        try:
+            yield session
+        finally:
+            await session.close()

pyproject.toml

@@ -19,4 +19,6 @@ dependencies = [
     "google-generativeai>=0.4.1",
     "pydantic-settings>=2.2.1",
     "prometheus-fastapi-instrumentator>=7.0.0",
+    "razorpay>=1.4.1",
+    "httpx>=0.27.0",
 ]

uv.lock

@@ -644,6 +644,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/04/4b/29cac41a4d98d144bf5f6d33995617b185d14b22401f75ca86f384e87ff1/h11-0.16.0-py3-none-any.whl", hash = "sha256:63cf8bbe7522de3bf65932fda1d9c2772064ffb3dae62d55932da54b31cb6c86", size = 37515, upload-time = "2025-04-24T03:35:24.344Z" },
 ]
 
+[[package]]
+name = "httpcore"
+version = "1.0.9"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "certifi" },
+    { name = "h11" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/06/94/82699a10bca87a5556c9c59b5963f2d039dbd239f25bc2a63907a05a14cb/httpcore-1.0.9.tar.gz", hash = "sha256:6e34463af53fd2ab5d807f399a9b45ea31c3dfa2276f15a2c3f00afff6e176e8", size = 85484, upload-time = "2025-04-24T22:06:22.219Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/7e/f5/f66802a942d491edb555dd61e3a9961140fd64c90bce1eafd741609d334d/httpcore-1.0.9-py3-none-any.whl", hash = "sha256:2d400746a40668fc9dec9810239072b40b4484b640a8c38fd654a024c7a1bf55", size = 78784, upload-time = "2025-04-24T22:06:20.566Z" },
+]
+
 [[package]]
 name = "httplib2"
 version = "0.31.2"
@@ -692,6 +705,21 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/48/63/b906c01e53f50d432c0defe43ce52764a111dc1bdd028bafbeb54dcfd008/httptools-0.8.0-cp314-cp314t-win_amd64.whl", hash = "sha256:384c17174464c8e873398b7af24f0b1f44d992c820328413951a625323155d77", size = 108209, upload-time = "2026-05-25T22:17:39.473Z" },
 ]
 
+[[package]]
+name = "httpx"
+version = "0.28.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "anyio" },
+    { name = "certifi" },
+    { name = "httpcore" },
+    { name = "idna" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/b1/df/48c586a5fe32a0f01324ee087459e112ebb7224f646c0b5023f5e79e9956/httpx-0.28.1.tar.gz", hash = "sha256:75e98c5f16b0f35b567856f597f06ff2270a374470a5c2392242528e3e3e42fc", size = 141406, upload-time = "2024-12-06T15:37:23.222Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/2a/39/e50c7c3a983047577ee07d2a9e53faf5a69493943ec3f6a384bdc792deb2/httpx-0.28.1-py3-none-any.whl", hash = "sha256:d909fcccc110f8c7faf814ca82a9a4d816bc5a6dbfea25d6591d6985b8ba59ad", size = 73517, upload-time = "2024-12-06T15:37:21.509Z" },
+]
+
 [[package]]
 name = "idna"
 version = "3.18"
@@ -1481,12 +1509,14 @@ dependencies = [
     { name = "asyncpg" },
     { name = "fastapi" },
     { name = "google-generativeai" },
+    { name = "httpx" },
     { name = "pandas", version = "2.3.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.14'" },
     { name = "pandas", version = "3.0.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.14'" },
     { name = "pandas-ta" },
     { name = "prometheus-fastapi-instrumentator" },
     { name = "psycopg2-binary" },
     { name = "pydantic-settings" },
+    { name = "razorpay" },
     { name = "redis" },
     { name = "sqlalchemy", extra = ["mypy"] },
     { name = "uvicorn", extra = ["standard"] },
@@ -1500,11 +1530,13 @@ requires-dist = [
     { name = "asyncpg", specifier = ">=0.29.0" },
     { name = "fastapi", specifier = ">=0.110.0" },
     { name = "google-generativeai", specifier = ">=0.4.1" },
+    { name = "httpx", specifier = ">=0.27.0" },
     { name = "pandas", specifier = ">=2.2.1" },
     { name = "pandas-ta", specifier = ">=0.3.14b0" },
     { name = "prometheus-fastapi-instrumentator", specifier = ">=7.0.0" },
     { name = "psycopg2-binary", specifier = ">=2.9.9" },
     { name = "pydantic-settings", specifier = ">=2.2.1" },
+    { name = "razorpay", specifier = ">=1.4.1" },
     { name = "redis", specifier = ">=5.0.3" },
     { name = "sqlalchemy", extras = ["mypy"], specifier = ">=2.0.28" },
     { name = "uvicorn", extras = ["standard"], specifier = ">=0.28.0" },
@@ -1512,6 +1544,18 @@ requires-dist = [
     { name = "yfinance", specifier = ">=0.2.37" },
 ]
 
+[[package]]
+name = "razorpay"
+version = "2.0.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "requests" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/d1/e4/877eb8ba68bb5212021b25a4f97b6c3f693e08bb6b319fc97c966c4391a3/razorpay-2.0.1.tar.gz", hash = "sha256:a766b9019e496c995906f75c31900bff8b2709bea251f1771925d742cba53e5b", size = 197169, upload-time = "2026-03-09T12:59:03.445Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/7f/35/e8fbf239cb16595007839408f7645bc952d8490f5dd50f9049434f296ce8/razorpay-2.0.1-py3-none-any.whl", hash = "sha256:e6a60c78203a3e1d3fc428e6fadf15bc67f75bd67217eaf9dc9925c87e98bc7a", size = 176920, upload-time = "2026-03-09T12:59:01.99Z" },
+]
+
 [[package]]
 name = "redis"
 version = "8.0.0"