Py Data

Skip to content

Latest posts

From API Calls to Alerts: Building a Production‑Ready Sequential Hypothesis Testing Pipeline

Ever watched a dashboard flash “drift detected” every few minutes only to discover the model was fine? The culprit is usually a naïve per‑batch p‑v…

Two Years of Airflow at Scale: A Production‑Ready RSS Ingestion DAG from Stripe Blog

Ever spent a whole afternoon watching an Airflow DAG sit idle because a simple RSS poll kept timing out, only to discover the backfill duplicated r…

Architecting for Change: Data Vault vs. Star Schema for Evolving API Data in a Lakehouse

When a lakehouse ingests data from an upstream REST API that keeps adding fields, renaming columns, or mutating existing values, you quickly run in…

Beyond Atomic: Advanced Iceberg Lakehouse Patterns for Production Pipelines

Ever stared at a growing lakehouse table and wondered how to add new rows without re‑scanning the whole thing, or how to slip a new column into a l…

Is Your RSS Feed Lying to You? Temporal Purity When Ingesting Discord Engineering's RSS

Is Your RSS Feed Lying to You? Temporal Purity When Ingesting Discord Engineering's RSS

I learned this the hard way while extending the NEPSE feature pipeline from my previous post. That pipeline guarded against macro-indicator leaka…

<script type="text/javascript" src="https://www.blogger.com/static/v1/widgets/207833187-widgets.js"></script>
<script type='text/javascript'>
window['__wavt'] = 'AKZvMztQcwgbKKYJCft-cpME1ypt:1793436231391';_WidgetManager._Init('//www.blogger.com/rearrange?blogID\x3d9085610809481687705','//blogs.mausamadhikari.com.np/','9085610809481687705');
_WidgetManager._SetDataContext([{'name': 'blog', 'data': {'blogId': '9085610809481687705', 'title': 'Py Data', 'url': 'http://blogs.mausamadhikari.com.np/', 'canonicalUrl': 'http://blogs.mausamadhikari.com.np/', 'homepageUrl': 'http://blogs.mausamadhikari.com.np/', 'searchUrl': 'http://blogs.mausamadhikari.com.np/search', 'canonicalHomepageUrl': 'http://blogs.mausamadhikari.com.np/', 'blogspotFaviconUrl': 'http://blogs.mausamadhikari.com.np/favicon.ico', 'bloggerUrl': 'https://www.blogger.com', 'hasCustomDomain': true, 'httpsEnabled': true, 'enabledCommentProfileImages': true, 'gPlusViewType': 'FILTERED_POSTMOD', 'adultContent': false, 'analyticsAccountNumber': 'G-Y1PBH6L2JV', 'analytics4': true, 'encoding': 'UTF-8', 'locale': 'en-GB', 'localeUnderscoreDelimited': 'en_gb', 'languageDirection': 'ltr', 'isPrivate': false, 'isMobile': false, 'isMobileRequest': false, 'mobileClass': '', 'isPrivateBlog': false, 'isDynamicViewsAvailable': true, 'feedLinks': '\x3clink rel\x3d\x22alternate\x22 type\x3d\x22application/atom+xml\x22 title\x3d\x22Py Data - Atom\x22 href\x3d\x22http://blogs.mausamadhikari.com.np/feeds/posts/default\x22 /\x3e\n\x3clink rel\x3d\x22alternate\x22 type\x3d\x22application/rss+xml\x22 title\x3d\x22Py Data - RSS\x22 href\x3d\x22http://blogs.mausamadhikari.com.np/feeds/posts/default?alt\x3drss\x22 /\x3e\n\x3clink rel\x3d\x22service.post\x22 type\x3d\x22application/atom+xml\x22 title\x3d\x22Py Data - Atom\x22 href\x3d\x22https://www.blogger.com/feeds/9085610809481687705/posts/default\x22 /\x3e\n', 'meTag': '', 'adsenseClientId': 'ca-pub-2325414716748127', 'adsenseHostId': 'ca-host-pub-1556223355139109', 'adsenseHasAds': true, 'adsenseAutoAds': true, 'boqCommentIframeForm': true, 'loginRedirectParam': '', 'view': '', 'dynamicViewsCommentsSrc': '//www.blogblog.com/dynamicviews/4224c15c4e7c9321/js/comments.js', 'dynamicViewsScriptSrc': '//www.blogblog.com/dynamicviews/de67cdcffbc8a898', 'plusOneApiSrc': 'https://apis.google.com/js/platform.js', 'disableGComments': true, 'interstitialAccepted': false, 'sharing': {'platforms': [{'name': 'Get link', 'key': 'link', 'shareMessage': 'Get link', 'target': ''}, {'name': 'Facebook', 'key': 'facebook', 'shareMessage': 'Share to Facebook', 'target': 'facebook'}, {'name': 'BlogThis!', 'key': 'blogThis', 'shareMessage': 'BlogThis!', 'target': 'blog'}, {'name': 'X', 'key': 'twitter', 'shareMessage': 'Share to X', 'target': 'twitter'}, {'name': 'Pinterest', 'key': 'pinterest', 'shareMessage': 'Share to Pinterest', 'target': 'pinterest'}, {'name': 'Email', 'key': 'email', 'shareMessage': 'Email', 'target': 'email'}], 'disableGooglePlus': true, 'googlePlusShareButtonWidth': 0, 'googlePlusBootstrap': '\x3cscript type\x3d\x22text/javascript\x22\x3ewindow.___gcfg \x3d {\x27lang\x27: \x27en_GB\x27};\x3c/script\x3e'}, 'hasCustomJumpLinkMessage': false, 'jumpLinkMessage': 'Read more', 'pageType': 'index', 'pageName': '', 'pageTitle': 'Py Data', 'metaDescription': 'Data engineering is the art of extracting knowledge from data sources, storing and organizing it, and finally making it available to the right users.'}}, {'name': 'features', 'data': {}}, {'name': 'messages', 'data': {'edit': 'Edit', 'linkCopiedToClipboard': 'Link copied to clipboard', 'ok': 'Ok', 'postLink': 'Post link'}}, {'name': 'template', 'data': {'name': 'custom', 'localizedName': 'Custom', 'isResponsive': true, 'isAlternateRendering': false, 'isCustom': true}}, {'name': 'view', 'data': {'classic': {'name': 'classic', 'url': '?view\x3dclassic'}, 'flipcard': {'name': 'flipcard', 'url': '?view\x3dflipcard'}, 'magazine': {'name': 'magazine', 'url': '?view\x3dmagazine'}, 'mosaic': {'name': 'mosaic', 'url': '?view\x3dmosaic'}, 'sidebar': {'name': 'sidebar', 'url': '?view\x3dsidebar'}, 'snapshot': {'name': 'snapshot', 'url': '?view\x3dsnapshot'}, 'timeslide': {'name': 'timeslide', 'url': '?view\x3dtimeslide'}, 'isMobile': false, 'title': 'Py Data', 'description': 'Data engineering is the art of extracting knowledge from data sources, storing and organizing it, and finally making it available to the right users.', 'url': 'http://blogs.mausamadhikari.com.np/', 'type': 'feed', 'isSingleItem': false, 'isMultipleItems': true, 'isError': false, 'isPage': false, 'isPost': false, 'isHomepage': true, 'isArchive': false, 'isLabelSearch': false}}, {'name': 'widgets', 'data': [{'title': 'Py Data (Header)', 'type': 'Header', 'sectionId': 'sec_Header_Title', 'id': 'Header01'}, {'title': 'Try \x27Data\x27', 'type': 'BlogSearch', 'sectionId': 'sec_Header_Search', 'id': 'BlogSearch01'}, {'title': 'Header Icon', 'type': 'TextList', 'sectionId': 'sec_Header_Icon', 'id': 'TextList01'}, {'title': 'Contributors', 'type': 'Profile', 'sectionId': 'sec_Header_Icon', 'id': 'Profile01'}, {'title': 'Bookmark Posts', 'type': 'LinkList', 'sectionId': 'sec_Header_Icon', 'id': 'LinkList02'}, {'title': 'Translate', 'type': 'LinkList', 'sectionId': 'sec_Header_Icon', 'id': 'LinkList03'}, {'title': 'Navigation Menu', 'type': 'HTML', 'sectionId': 'sec_Nav_Widgets_1', 'id': 'HTML01'}, {'title': 'Additional Links', 'type': 'PageList', 'sectionId': 'sec_Nav_Widgets_2', 'id': 'PageList02'}, {'title': 'Social Links', 'type': 'LinkList', 'sectionId': 'sec_Nav_Widgets_2', 'id': 'LinkList04'}, {'title': 'Tabbed Menu', 'type': 'LinkList', 'sectionId': 'sec_Notif_Widgets', 'id': 'LinkList05'}, {'title': 'Pinned Post', 'type': 'FeaturedPost', 'sectionId': 'sec_Top_Widgets', 'id': 'FeaturedPost01', 'postId': '6951130921020610316'}, {'title': 'Blog Posts', 'type': 'Blog', 'sectionId': 'sec_Main_Widgets', 'id': 'Blog01', 'posts': [{'id': '6951130921020610316', 'title': 'From Todos to Trades: Building a NEPSE Moving\u2011Average Screener in 30 Minutes', 'showInlineAds': false}, {'id': '124699967552389490', 'title': 'From API Calls to Alerts: Building a Production\u2011Ready Sequential Hypothesis Testing Pipeline', 'showInlineAds': false}, {'id': '5027214058535077544', 'title': 'Two Years of Airflow at Scale: A Production\u2011Ready RSS Ingestion DAG from Stripe Blog', 'showInlineAds': false}, {'id': '6795349925188047588', 'title': 'Architecting for Change: Data Vault vs. Star Schema for Evolving API Data in a Lakehouse', 'showInlineAds': false}, {'id': '1362200512579159000', 'title': 'Beyond Atomic: Advanced Iceberg Lakehouse Patterns for Production Pipelines', 'showInlineAds': false}, {'id': '7608468626949029001', 'title': 'Is Your RSS Feed Lying to You? Temporal Purity When Ingesting Discord Engineering\x27s RSS', 'featuredImage': 'https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_uC5p1UwtWl_s5fhQAK2GOHNxj5qUV1oOf-ExyncxtDO7BjCvIAanXd5NUVhbPJhWOgO8qcVTXOfMi9XjUyY73qZx_-d8x5ffrYnSHlKYHXgF4knLm-R0WWvXWvMNSHKPrX3_SAhRD4u1S8je2soNHCoWlUZR5yH-kuApylLlJQ93putp3I0Q-JYZQ4TINrQpMRfWuSFaM2ATCt5s51BSZz9g9t5hQ', 'showInlineAds': false}], 'footerBylines': [{'regionName': 'footer1', 'items': [{'name': 'author', 'label': 'Published by'}, {'name': 'timestamp', 'label': 'On'}, {'name': 'comments', 'label': 'Comment'}, {'name': 'icons', 'label': ''}, {'name': 'share', 'label': ''}]}, {'regionName': 'footer2', 'items': [{'name': 'labels', 'label': 'in'}]}, {'regionName': 'footer3', 'items': [{'name': 'location', 'label': 'Location:'}]}], 'allBylineItems': [{'name': 'author', 'label': 'Published by'}, {'name': 'timestamp', 'label': 'On'}, {'name': 'comments', 'label': 'Comment'}, {'name': 'icons', 'label': ''}, {'name': 'share', 'label': ''}, {'name': 'labels', 'label': 'in'}, {'name': 'location', 'label': 'Location:'}]}, {'title': 'Table of contents', 'type': 'HTML', 'sectionId': 'sec_Main_Widgets', 'id': 'HTML11'}, {'title': 'Popular Posts', 'type': 'PopularPosts', 'sectionId': 'sec_Side_Widgets', 'id': 'PopularPosts01', 'posts': [{'title': 'Beyond Vector Search: Engineering a Two\u2011Stage Reranking Pipeline for Production RAG', 'id': 4195453945346001245}, {'title': 'Unlocking Async Speed: Mastering asyncio for Scalable Python Applications', 'id': 1649114298334329235}, {'title': 'From Code to Insight: Building a Production\u2011Ready Semantic Search on GitHub Repos', 'id': 3762424343749636904}, {'title': 'Python Overview: Features, Applications, and Why It Matters', 'id': 6383063552111967885}, {'title': 'Architecting Adaptive Agents: Context-Driven Tool Selection from Dynamic External Feeds', 'id': 5429667684865742298}]}, {'title': 'Google Ads', 'type': 'HTML', 'sectionId': 'sec_Side_Sticky', 'id': 'HTML1'}, {'title': 'Take me back', 'type': 'HTML', 'sectionId': 'sec_Error_404', 'id': 'HTML404'}, {'title': 'Py Data', 'type': 'Image', 'sectionId': 'sec_Footer_Widgets_1', 'id': 'Image21'}, {'title': 'Social Media Links', 'type': 'LinkList', 'sectionId': 'sec_Footer_Widgets_1', 'id': 'LinkList21'}, {'title': 'Credit', 'type': 'HTML', 'sectionId': 'sec_Footer_Credit', 'id': 'HTML21'}, {'title': 'Mobile Menu', 'type': 'TextList', 'sectionId': 'sec_Mobile_Menu', 'id': 'TextList99'}, {'title': 'Labels', 'type': 'Label', 'sectionId': 'sec_Theme_Hidden', 'id': 'Label41'}, {'title': '\u09af\u09cb\u0997\u09be\u09af\u09cb\u0997 \u09ab\u09b0\u09cd\u09ae', 'type': 'ContactForm', 'sectionId': 'sec_Theme_Hidden', 'id': 'ContactForm41'}, {'title': 'Pageviews last month', 'type': 'Stats', 'sectionId': 'sec_Theme_Hidden', 'id': 'Stats41'}, {'title': 'Progressive Web App', 'type': 'LinkList', 'sectionId': 'sec_Addon_Widgets', 'id': 'LinkList62'}, {'title': 'Cookie Consent [NoTitle]', 'type': 'LinkList', 'sectionId': 'sec_Addon_Widgets', 'id': 'LinkList63'}, {'title': 'Image Uploader', 'type': 'Image', 'sectionId': 'sec_Addon_Widgets', 'id': 'Image61'}]}]);
_WidgetManager._RegisterWidget('_HeaderView', new _WidgetInfo('Header01', 'sec_Header_Title', document.getElementById('Header01'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_BlogSearchView', new _WidgetInfo('BlogSearch01', 'sec_Header_Search', document.getElementById('BlogSearch01'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_TextListView', new _WidgetInfo('TextList01', 'sec_Header_Icon', document.getElementById('TextList01'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_ProfileView', new _WidgetInfo('Profile01', 'sec_Header_Icon', document.getElementById('Profile01'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList02', 'sec_Header_Icon', document.getElementById('LinkList02'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList03', 'sec_Header_Icon', document.getElementById('LinkList03'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML01', 'sec_Nav_Widgets_1', document.getElementById('HTML01'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_PageListView', new _WidgetInfo('PageList02', 'sec_Nav_Widgets_2', document.getElementById('PageList02'), {'title': 'Additional Links', 'links': [{'isCurrentPage': false, 'href': '/p/sitemap.html', 'title': 'Sitemap'}, {'isCurrentPage': false, 'href': '#', 'title': 'Disclaimer'}, {'isCurrentPage': false, 'href': '#', 'title': 'Privacy'}], 'mobile': false, 'showPlaceholder': true, 'hasCurrentPage': false}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList04', 'sec_Nav_Widgets_2', document.getElementById('LinkList04'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList05', 'sec_Notif_Widgets', document.getElementById('LinkList05'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_FeaturedPostView', new _WidgetInfo('FeaturedPost01', 'sec_Top_Widgets', document.getElementById('FeaturedPost01'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_BlogView', new _WidgetInfo('Blog01', 'sec_Main_Widgets', document.getElementById('Blog01'), {'cmtInteractionsEnabled': false, 'lightboxEnabled': true, 'lightboxModuleUrl': 'https://www.blogger.com/static/v1/jsbin/1444637187-lbx__en_gb.js', 'lightboxCssUrl': 'https://www.blogger.com/static/v1/v-css/828616780-lightbox_bundle.css'}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML11', 'sec_Main_Widgets', document.getElementById('HTML11'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_PopularPostsView', new _WidgetInfo('PopularPosts01', 'sec_Side_Widgets', document.getElementById('PopularPosts01'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML1', 'sec_Side_Sticky', document.getElementById('HTML1'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML404', 'sec_Error_404', document.getElementById('HTML404'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_ImageView', new _WidgetInfo('Image21', 'sec_Footer_Widgets_1', document.getElementById('Image21'), {'resize': true}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList21', 'sec_Footer_Widgets_1', document.getElementById('LinkList21'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML21', 'sec_Footer_Credit', document.getElementById('HTML21'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_TextListView', new _WidgetInfo('TextList99', 'sec_Mobile_Menu', document.getElementById('TextList99'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LabelView', new _WidgetInfo('Label41', 'sec_Theme_Hidden', document.getElementById('Label41'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_ContactFormView', new _WidgetInfo('ContactForm41', 'sec_Theme_Hidden', document.getElementById('ContactForm41'), {'contactFormMessageSendingMsg': 'Sending...', 'contactFormMessageSentMsg': 'Your message has been sent.', 'contactFormMessageNotSentMsg': 'Message could not be sent. Please try again later.', 'contactFormInvalidEmailMsg': 'A valid email address is required.', 'contactFormEmptyMessageMsg': 'Message field cannot be empty.', 'title': '\u09af\u09cb\u0997\u09be\u09af\u09cb\u0997 \u09ab\u09b0\u09cd\u09ae', 'blogId': '9085610809481687705', 'contactFormNameMsg': 'Name', 'contactFormEmailMsg': 'Email', 'contactFormMessageMsg': 'Message', 'contactFormSendMsg': 'Send', 'contactFormToken': 'AKZvMzu4xZRsoL7KPbDtCyFVGxl-:1793436778371', 'submitUrl': 'https://www.blogger.com/contact-form'}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_StatsView', new _WidgetInfo('Stats41', 'sec_Theme_Hidden', document.getElementById('Stats41'), {'title': 'Pageviews last month', 'showGraphicalCounter': false, 'showAnimatedCounter': false, 'showSparkline': true, 'statsUrl': '//blogs.mausamadhikari.com.np/b/stats?style\x3dBLACK_TRANSPARENT\x26timeRange\x3dLAST_WEEK\x26token\x3dANakCksJ8XztAFfqJGnjlqEDR3Pkb88HtM24XRsYwGspZ27QLOsPkGVKLSwZz31msN_8PZHdkcKqrJDawBZTPaM'}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList62', 'sec_Addon_Widgets', document.getElementById('LinkList62'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList63', 'sec_Addon_Widgets', document.getElementById('LinkList63'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_ImageView', new _WidgetInfo('Image61', 'sec_Addon_Widgets', document.getElementById('Image61'), {'resize': false}, 'displayModeFull'));
</script>
</body>