diff --git a/api/main.py b/api/main.py
index b6b3fdc..71562bf 100644
--- a/api/main.py
+++ b/api/main.py
@@ -1,39 +1,52 @@
+import logging
 from contextlib import asynccontextmanager
-import os
 
 from fastapi import FastAPI
-from api.routes import templates, forms
-from api.db.init_db import init_db
-from api.errors.handlers import register_exception_handlers
 from fastapi.middleware.cors import CORSMiddleware
+from sqlmodel import SQLModel
+
+from api.db.database import engine
 from api.routes import forms, templates
+from api.errors.handlers import register_exception_handlers
+from api.middleware.rate_limiter import register_rate_limiter
+
+logger = logging.getLogger("fireform")
+
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
-    # Startup: Initialize the database and seed it if necessary
-    print("Initializing database...")
-    init_db()
+    logger.info("Starting FireForm — initializing database tables")
+    SQLModel.metadata.create_all(engine)
+    logger.info("Database tables ready")
     yield
-    # Shutdown logic goes here if needed
+    logger.info("Shutting down FireForm")
 
-app = FastAPI(lifespan=lifespan)
 
-register_exception_handlers(app)
+app = FastAPI(
+    title="FireForm API",
+    description="AI-powered PDF form filling for first responders",
+    version="0.1.0",
+    lifespan=lifespan,
+)
 
-default_origins = "http://127.0.0.1:5173"
-allowed_origins = [
-    origin.strip()
-    for origin in os.getenv("FRONTEND_ORIGINS", default_origins).split(",")
-    if origin.strip()
-]
+register_exception_handlers(app)
+register_rate_limiter(app)
 
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=allowed_origins,
-    allow_credentials=False,
+    allow_origins=[
+        "http://127.0.0.1:5500",
+        "http://localhost:5500",
+    ],
+    allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
 )
 
 app.include_router(templates.router)
 app.include_router(forms.router)
+
+
+@app.get("/health", tags=["system"])
+def health_check():
+    return {"status": "healthy", "service": "fireform"}
\ No newline at end of file
diff --git a/frontend/app.js b/frontend/app.js
index 2f6de80..5a3104d 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -32,6 +32,8 @@ const elements = {
 let templates = loadTemplates();
 let activeObjectUrl = null;
 let selectedTemplateFile = null;
+let isTemplateSubmitting = false;
+let isFillSubmitting = false;
 
 initialize();
 
@@ -246,6 +248,14 @@ function normalizeFields(rawFields) {
 
 async function handleTemplateSubmit(event) {
   event.preventDefault();
+
+  if (isTemplateSubmitting) {
+    setStatus(elements.templateFormMessage, "Request already in progress...", "info");
+    return;
+  }
+
+  isTemplateSubmitting = true;
+
   clearJson(elements.templateFormResponse);
   setStatus(elements.templateFormMessage, "");
 
@@ -259,11 +269,13 @@ async function handleTemplateSubmit(event) {
       "Name, PDF file, and template directory are required.",
       "error"
     );
+    isTemplateSubmitting = false;
     return;
   }
 
   if (normalized.error) {
     setStatus(elements.templateFormMessage, normalized.error, "error");
+    isTemplateSubmitting = false;
     return;
   }
 
@@ -280,6 +292,7 @@ async function handleTemplateSubmit(event) {
     };
 
     setStatus(elements.templateFormMessage, "Creating template...", "info");
+
     const response = await fetch(`${API_BASE_URL}/templates/create`, {
       method: "POST",
       headers: { "Content-Type": "application/json" },
@@ -287,12 +300,14 @@ async function handleTemplateSubmit(event) {
     });
 
     const body = await parseJsonResponse(response);
+
     if (!response.ok) {
       throw new Error(extractErrorMessage(body, response.status));
     }
 
     upsertTemplate(body);
     await refreshTemplatesFromApi();
+
     elements.fillTemplateId.value = String(body.id || "");
     elements.serverPdfPath.value = body.pdf_path || "";
 
@@ -301,12 +316,16 @@ async function handleTemplateSubmit(event) {
       `Template created (id: ${body.id}). PDF saved at ${upload.pdf_path}.`,
       "success"
     );
+
     showJson(elements.templateFormResponse, body);
   } catch (error) {
     setStatus(elements.templateFormMessage, error.message, "error");
+  } finally {
+    isTemplateSubmitting = false;
   }
 }
 
+
 async function uploadTemplatePdf(file, directory) {
   const formData = new FormData();
   formData.append("file", file, file.name);
@@ -327,6 +346,14 @@ async function uploadTemplatePdf(file, directory) {
 
 async function handleFillSubmit(event) {
   event.preventDefault();
+
+  if (isFillSubmitting) {
+    setStatus(elements.fillFormMessage, "Request already in progress...", "info");
+    return;
+  }
+
+  isFillSubmitting = true;
+
   clearJson(elements.fillFormResponse);
   setStatus(elements.fillFormMessage, "");
 
@@ -335,11 +362,13 @@ async function handleFillSubmit(event) {
 
   if (!Number.isInteger(templateId) || templateId < 1) {
     setStatus(elements.fillFormMessage, "Template ID must be a positive integer.", "error");
+    isFillSubmitting = false;
     return;
   }
 
   if (!inputText) {
     setStatus(elements.fillFormMessage, "Input text is required.", "error");
+    isFillSubmitting = false;
     return;
   }
 
@@ -350,6 +379,7 @@ async function handleFillSubmit(event) {
 
   try {
     setStatus(elements.fillFormMessage, "Submitting form fill request...", "info");
+
     const response = await fetch(`${API_BASE_URL}/forms/fill`, {
       method: "POST",
       headers: { "Content-Type": "application/json" },
@@ -357,6 +387,7 @@ async function handleFillSubmit(event) {
     });
 
     const body = await parseJsonResponse(response);
+
     if (!response.ok) {
       throw new Error(extractErrorMessage(body, response.status));
     }
@@ -372,9 +403,12 @@ async function handleFillSubmit(event) {
       `Form filled (submission id: ${body.id}).`,
       "success"
     );
+
     showJson(elements.fillFormResponse, body);
   } catch (error) {
     setStatus(elements.fillFormMessage, error.message, "error");
+  } finally {
+    isFillSubmitting = false;
   }
 }
 
diff --git a/tests/test_template_file_routes.py b/tests/test_template_file_routes.py
new file mode 100644
index 0000000..7bae8c8
--- /dev/null
+++ b/tests/test_template_file_routes.py
@@ -0,0 +1,71 @@
+from fastapi.testclient import TestClient
+from api.main import app
+
+client = TestClient(app)
+
+
+def test_upload_template_pdf():
+    pdf_content = b"%PDF-1.4 test pdf content"
+
+    files = {
+        "file": ("sample_test.pdf", pdf_content, "application/pdf")
+    }
+
+    data = {
+        "directory": "src/inputs"
+    }
+
+    response = client.post(
+        "/templates/upload",
+        files=files,
+        data=data
+    )
+
+    assert response.status_code == 200
+
+    response_data = response.json()
+
+    assert "filename" in response_data
+    assert "pdf_path" in response_data
+    assert response_data["filename"].endswith(".pdf")
+
+
+def test_preview_template_pdf():
+    response = client.get(
+        "/templates/preview",
+        params={"path": "src/inputs/file.pdf"}
+    )
+
+    assert response.status_code == 200
+    assert response.headers["content-type"] == "application/pdf"
+    
+def test_upload_non_pdf_should_fail():
+    files = {
+        "file": ("sample.txt", b"not a pdf", "text/plain")
+    }
+
+    response = client.post(
+        "/templates/upload",
+        files=files,
+        data={"directory": "src/inputs"}
+    )
+
+    assert response.status_code == 400
+
+
+def test_preview_missing_file_should_fail():
+    response = client.get(
+        "/templates/preview",
+        params={"path": "src/inputs/does_not_exist.pdf"}
+    )
+
+    assert response.status_code == 404
+
+
+def test_preview_outside_project_should_fail():
+    response = client.get(
+        "/templates/preview",
+        params={"path": "/etc/passwd"}
+    )
+
+    assert response.status_code == 400