[P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item · Issue #129 · SaplingLearn/Sapling

Severity: MEDIUM + LOW · Source: docs/backend-contract-bug-audit.md (findings #10, #29)

Create skeletons for loading pages #10 [MEDIUM] Quiz submit has no idempotency — resubmission double-counts mastery/streak — routes/quiz.py:355-436. submit_quiz sets completed_at (:432) but never reads it; re-POSTing the same quiz_id re-applies the mastery delta, increments times_studied, appends another event, re-runs update_streak. Fix: if attempt.get("completed_at") is set, return the stored result (or 409).
Add in-app bug report form #29 [LOW] Free point for an unanswered, no-correct-option question — routes/quiz.py:372-379. Both selected and correct_label default to '', so is_correct = '' == '' is True for a malformed item, inflating score and mastery delta. Fix:is_correct = bool(correct_opt) and selected == correct_label.

blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks"); } } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); } })(); (function(){ try { var __m = "github.com"; var __re = new RegExp('^' + "github\\.com" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. 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SaplingLearn /SaplingPublic Notifications You must be signed in to change notification settings Fork 0 Star 2 Code Issues22 Pull requests13 Actions Projects Security and quality0 Insights Additional navigation options Code Issues Pull requests Actions Projects Security and quality Insights [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item #129 Copy link Copy link Closed #464 Closed [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item#129 #464 Copy link Assignees Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Description AndresL230 opened on Jun 8, 2026 Issue body actions Severity: MEDIUM + LOW · Source: docs/backend-contract-bug-audit.md (findings #10, #29) Create skeletons for loading pages #10 [MEDIUM] Quiz submit has no idempotency — resubmission double-counts mastery/streak — routes/quiz.py:355-436. submit_quiz sets completed_at (:432) but never reads it; re-POSTing the same quiz_id re-applies the mastery delta, increments times_studied, appends another event, re-runs update_streak. Fix: if attempt.get("completed_at") is set, return the stored result (or 409). Add in-app bug report form #29 [LOW] Free point for an unanswered, no-correct-option question — routes/quiz.py:372-379. Both selected and correct_label default to '', so is_correct = '' == '' is True for a malformed item, inflating score and mastery delta. Fix:is_correct = bool(correct_opt) and selected == correct_label. Reactions are currently unavailable Metadata Metadata Assignees lpcooper-arch Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Type No type Projects No projects Milestone No milestone Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. 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SaplingLearn /SaplingPublic Notifications You must be signed in to change notification settings Fork 0 Star 2 Code Issues22 Pull requests13 Actions Projects Security and quality0 Insights Additional navigation options Code Issues Pull requests Actions Projects Security and quality Insights [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item #129 Copy link Copy link Closed #464 Closed [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item#129 #464 Copy link Assignees Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Description AndresL230 opened on Jun 8, 2026 Issue body actions Severity: MEDIUM + LOW · Source: docs/backend-contract-bug-audit.md (findings #10, #29) Create skeletons for loading pages #10 [MEDIUM] Quiz submit has no idempotency — resubmission double-counts mastery/streak — routes/quiz.py:355-436. submit_quiz sets completed_at (:432) but never reads it; re-POSTing the same quiz_id re-applies the mastery delta, increments times_studied, appends another event, re-runs update_streak. Fix: if attempt.get("completed_at") is set, return the stored result (or 409). Add in-app bug report form #29 [LOW] Free point for an unanswered, no-correct-option question — routes/quiz.py:372-379. Both selected and correct_label default to '', so is_correct = '' == '' is True for a malformed item, inflating score and mastery delta. Fix:is_correct = bool(correct_opt) and selected == correct_label. Reactions are currently unavailable Metadata Metadata Assignees lpcooper-arch Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Type No type Projects No projects Milestone No milestone Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. 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SaplingLearn /SaplingPublic Notifications You must be signed in to change notification settings Fork 0 Star 2 Code Issues22 Pull requests13 Actions Projects Security and quality0 Insights Additional navigation options Code Issues Pull requests Actions Projects Security and quality Insights [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item #129 Copy link Copy link Closed #464 Closed [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item#129 #464 Copy link Assignees Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Description AndresL230 opened on Jun 8, 2026 Issue body actions Severity: MEDIUM + LOW · Source: docs/backend-contract-bug-audit.md (findings #10, #29) Create skeletons for loading pages #10 [MEDIUM] Quiz submit has no idempotency — resubmission double-counts mastery/streak — routes/quiz.py:355-436. submit_quiz sets completed_at (:432) but never reads it; re-POSTing the same quiz_id re-applies the mastery delta, increments times_studied, appends another event, re-runs update_streak. Fix: if attempt.get("completed_at") is set, return the stored result (or 409). Add in-app bug report form #29 [LOW] Free point for an unanswered, no-correct-option question — routes/quiz.py:372-379. Both selected and correct_label default to '', so is_correct = '' == '' is True for a malformed item, inflating score and mastery delta. Fix:is_correct = bool(correct_opt) and selected == correct_label. Reactions are currently unavailable Metadata Metadata Assignees lpcooper-arch Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Type No type Projects No projects Milestone No milestone Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. 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SaplingLearn /SaplingPublic Notifications You must be signed in to change notification settings Fork 0 Star 2 Code Issues22 Pull requests13 Actions Projects Security and quality0 Insights Additional navigation options Code Issues Pull requests Actions Projects Security and quality Insights [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item #129 Copy link Copy link Closed #464 Closed [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item#129 #464 Copy link Assignees Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Description AndresL230 opened on Jun 8, 2026 Issue body actions Severity: MEDIUM + LOW · Source: docs/backend-contract-bug-audit.md (findings #10, #29) Create skeletons for loading pages #10 [MEDIUM] Quiz submit has no idempotency — resubmission double-counts mastery/streak — routes/quiz.py:355-436. submit_quiz sets completed_at (:432) but never reads it; re-POSTing the same quiz_id re-applies the mastery delta, increments times_studied, appends another event, re-runs update_streak. Fix: if attempt.get("completed_at") is set, return the stored result (or 409). Add in-app bug report form #29 [LOW] Free point for an unanswered, no-correct-option question — routes/quiz.py:372-379. Both selected and correct_label default to '', so is_correct = '' == '' is True for a malformed item, inflating score and mastery delta. Fix:is_correct = bool(correct_opt) and selected == correct_label. Reactions are currently unavailable Metadata Metadata Assignees lpcooper-arch Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Type No type Projects No projects Milestone No milestone Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. 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SaplingLearn /SaplingPublic Notifications You must be signed in to change notification settings Fork 0 Star 2 Code Issues22 Pull requests13 Actions Projects Security and quality0 Insights Additional navigation options Code Issues Pull requests Actions Projects Security and quality Insights [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item #129 Copy link Copy link Closed #464 Closed [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item#129 #464 Copy link Assignees Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Description AndresL230 opened on Jun 8, 2026 Issue body actions Severity: MEDIUM + LOW · Source: docs/backend-contract-bug-audit.md (findings #10, #29) Create skeletons for loading pages #10 [MEDIUM] Quiz submit has no idempotency — resubmission double-counts mastery/streak — routes/quiz.py:355-436. submit_quiz sets completed_at (:432) but never reads it; re-POSTing the same quiz_id re-applies the mastery delta, increments times_studied, appends another event, re-runs update_streak. Fix: if attempt.get("completed_at") is set, return the stored result (or 409). Add in-app bug report form #29 [LOW] Free point for an unanswered, no-correct-option question — routes/quiz.py:372-379. Both selected and correct_label default to '', so is_correct = '' == '' is True for a malformed item, inflating score and mastery delta. Fix:is_correct = bool(correct_opt) and selected == correct_label. Reactions are currently unavailable Metadata Metadata Assignees lpcooper-arch Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Type No type Projects No projects Milestone No milestone Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. 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SaplingLearn /SaplingPublic Notifications You must be signed in to change notification settings Fork 0 Star 2 Code Issues22 Pull requests13 Actions Projects Security and quality0 Insights Additional navigation options Code Issues Pull requests Actions Projects Security and quality Insights [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item #129 Copy link Copy link Closed #464 Closed [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item#129 #464 Copy link Assignees Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Description AndresL230 opened on Jun 8, 2026 Issue body actions Severity: MEDIUM + LOW · Source: docs/backend-contract-bug-audit.md (findings #10, #29) Create skeletons for loading pages #10 [MEDIUM] Quiz submit has no idempotency — resubmission double-counts mastery/streak — routes/quiz.py:355-436. submit_quiz sets completed_at (:432) but never reads it; re-POSTing the same quiz_id re-applies the mastery delta, increments times_studied, appends another event, re-runs update_streak. Fix: if attempt.get("completed_at") is set, return the stored result (or 409). Add in-app bug report form #29 [LOW] Free point for an unanswered, no-correct-option question — routes/quiz.py:372-379. Both selected and correct_label default to '', so is_correct = '' == '' is True for a malformed item, inflating score and mastery delta. Fix:is_correct = bool(correct_opt) and selected == correct_label. Reactions are currently unavailable Metadata Metadata Assignees lpcooper-arch Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Type No type Projects No projects Milestone No milestone Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. 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SaplingLearn /SaplingPublic Notifications You must be signed in to change notification settings Fork 0 Star 2 Code Issues22 Pull requests13 Actions Projects Security and quality0 Insights Additional navigation options Code Issues Pull requests Actions Projects Security and quality Insights [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item #129 Copy link Copy link Closed #464 Closed [P2] Quiz scoring & idempotency: double-submit double-counts, free point on malformed item#129 #464 Copy link Assignees Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Description AndresL230 opened on Jun 8, 2026 Issue body actions Severity: MEDIUM + LOW · Source: docs/backend-contract-bug-audit.md (findings #10, #29) Create skeletons for loading pages #10 [MEDIUM] Quiz submit has no idempotency — resubmission double-counts mastery/streak — routes/quiz.py:355-436. submit_quiz sets completed_at (:432) but never reads it; re-POSTing the same quiz_id re-applies the mastery delta, increments times_studied, appends another event, re-runs update_streak. Fix: if attempt.get("completed_at") is set, return the stored result (or 409). Add in-app bug report form #29 [LOW] Free point for an unanswered, no-correct-option question — routes/quiz.py:372-379. Both selected and correct_label default to '', so is_correct = '' == '' is True for a malformed item, inflating score and mastery delta. Fix:is_correct = bool(correct_opt) and selected == correct_label. Reactions are currently unavailable Metadata Metadata Assignees lpcooper-arch Labels P2Medium priorityMedium prioritybackendBackend / APIBackend / APIbugSomething isn't workingSomething isn't working Type No type Projects No projects Milestone No milestone Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time.