Add CP→CA→PI platform foundation on MapMil monorepo.

Unify parsing workers, analytics API with PostgreSQL, map UI, and PI distribution into centers/ with Docker Compose.

Co-authored-by: Cursor <cursoragent@cursor.com>

centers/analytics/api/app/database.py

@@ -0,0 +1,28 @@
+import os
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import DeclarativeBase, sessionmaker
+
+DATABASE_URL = os.getenv(
+    "DATABASE_URL",
+    "postgresql://mapmil:mapmil@ca-db:5432/mapmil",
+)
+
+connect_args: dict = {}
+if DATABASE_URL.startswith("sqlite"):
+    connect_args = {"check_same_thread": False}
+
+engine = create_engine(DATABASE_URL, connect_args=connect_args)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()