added files for landlord_overrides

applications/landlord_overrides/Dockerfile

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+FROM public.ecr.aws/lambda/python:3.11
+
+# Postgres host/port/database are baked into the image at build time from
+# the deploy workflow's --build-arg values (GitHub Actions DEV_DB_* secrets),
+# mirroring backend/postcode_splitter/handler/Dockerfile. They map onto the
+# POSTGRES_* names PostgresConfig.from_env reads. Username/password are NOT
+# baked in -- Terraform injects those as Lambda env vars from Secrets Manager.
+ARG DEV_DB_HOST
+ARG DEV_DB_PORT
+ARG DEV_DB_NAME
+
+ENV POSTGRES_HOST=${DEV_DB_HOST}
+ENV POSTGRES_PORT=${DEV_DB_PORT}
+ENV POSTGRES_DATABASE=${DEV_DB_NAME}
+
+WORKDIR /var/task
+
+COPY applications/postcode_splitter/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the layered source the handler imports from. The new splitter pulls
+# only DDD-shaped packages — no pandas, no legacy backend/.
+COPY domain/ domain/
+COPY infrastructure/ infrastructure/
+COPY orchestration/ orchestration/
+COPY repositories/ repositories/
+COPY utilities/ utilities/
+COPY applications/ applications/
+
+# Place the handler at the Lambda task root so the runtime can resolve
+# ``main.handler`` without an extra package prefix.
+COPY applications/landlord_overrides/handler.py /var/task/main.py
+
+CMD ["main.handler"]

applications/landlord_overrides/handler.py

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+from typing import Any
+
+
+def handler(
+    body: dict[str, Any],
+    context: Any,
+) -> dict[str, list[str]]:
+    print("hello world")
+    return {"hello world": ["hello world"]}

applications/landlord_overrides/local_handler/.env.local.example

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+POSTGRES_HOST=
+POSTGRES_PORT=5432
+POSTGRES_USERNAME=
+POSTGRES_PASSWORD=
+POSTGRES_DATABASE=

applications/landlord_overrides/local_handler/docker-compose.yml

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+services:
+  landlord_overrides:
+    build:
+      context: ../../../
+      dockerfile: applications/landlord_overrides/Dockerfile
+    ports:
+      - "9002:8080"
+    env_file:
+      - .env.local

applications/landlord_overrides/local_handler/invoke_local_lambda.py

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+#!/usr/bin/env python3
+import json
+import requests
+
+HOST = "localhost"
+PORT = "9002"
+
+LAMBDA_URL = f"http://{HOST}:{PORT}/2015-03-31/functions/function/invocations"
+
+payload = {"Records": [{"body": json.dumps({})}]}
+
+response = requests.post(LAMBDA_URL, json=payload)
+
+print("Status code:", response.status_code)
+print("Response:")
+print(response.text)

applications/landlord_overrides/local_handler/run_local.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+cd "$(dirname "$0")"
+
+if [ ! -f .env.local ]; then
+  cp .env.local.example .env.local
+  echo "Created .env.local from the template — fill it in, then re-run." >&2
+  exit 1
+fi
+
+docker compose build --no-cache
+docker compose up --force-recreate

applications/landlord_overrides/requirements.txt

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+boto3
+pydantic
+sqlmodel
+psycopg2-binary