AI Dev Tool: Neki Sharded Postgres

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Preview Code

```python
# AI Dev Tool: FastAPI Postgres Sharding Micro-SaaS
# ================================================
# This is a production-ready developer code asset for building micro-SaaS applications
# using FastAPI, Postgres, and sharding for horizontal scaling.

import os
import uvicorn
from fastapi import FastAPI, Depends
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import Optional
from psycopg2 import connect, Error
from psycopg2.extras import DictCursor

# Define the Postgres connection settings
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
POSTGRES_PORT = os.environ.get("POSTGRES_PORT", 5432)
POSTGRES_USER = os.environ.get("POSTGRES_USER", "postgres")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "postgres")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "mydb")

# Define the sharding settings
SHARD_COUNT = int(os.environ.get("SHARD_COUNT", 5))

# ... full runnable version includes tests & documentation