diff --git a/README.md b/README.md
index 3660082..3d4d863 100644
--- a/README.md
+++ b/README.md
@@ -4,14 +4,8 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/arcodange/dance-lessons-coach)](https://goreportcard.com/report/github.com/arcodange/dance-lessons-coach)
 [![Version](https://img.shields.io/badge/version-1.4.0-blue.svg)](https://gitea.arcodange.fr/arcodange/dance-lessons-coach/releases)
 [![License](https://img.shields.io/badge/license-MIT-green.svg)](LICENSE)
-[![Unit Coverage](https://img.shields.io/badge/Unit_Coverage-9.8%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
-[![BDD Coverage](https://img.shields.io/badge/BDD_Coverage-46.0%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
-[![Unit Coverage](https://img.shields.io/badge/Unit_Coverage-10.1%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
-[![BDD Coverage](https://img.shields.io/badge/BDD_Coverage-46.3%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
-[![Unit Coverage](https://img.shields.io/badge/Unit_Coverage-9.4%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
-[![BDD Coverage](https://img.shields.io/badge/BDD_Coverage-59.2%-yellow?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
-[![BDD Coverage](https://img.shields.io/badge/BDD_Coverage-55.9%-yellow?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
-[![Unit Coverage](https://img.shields.io/badge/Unit_Coverage-8.4%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
+[![BDD Coverage](https://img.shields.io/badge/BDD_Coverage-0.0%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
+[![Unit Coverage](https://img.shields.io/badge/Unit_Coverage-0.0%-red?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)
 
 A Go project demonstrating idiomatic package structure, CLI implementation, and JSON API with Chi router.
 =======
diff --git a/scripts/ci-update-coverage-badge.sh b/scripts/ci-update-coverage-badge.sh
index 7be7477..aec5f4c 100755
--- a/scripts/ci-update-coverage-badge.sh
+++ b/scripts/ci-update-coverage-badge.sh
@@ -1,32 +1,22 @@
 #!/bin/bash
-# CI script to update coverage badge in README.md
-# Usage: scripts/ci-update-coverage-badge.sh <coverage_percentage> [badge_type] [flags]
-# badge_type can be "bdd", "unit", or empty for combined coverage
-# flags: --no-commit (skip git commit), --no-push (skip git push)
+# KISS coverage badge updater using line numbers
+# Usage: scripts/ci-update-coverage-badge.sh <coverage_percentage> [badge_type]
+# badge_type: "unit" or "bdd", defaults to "unit"
 
 set -e
 
-if [ -z "$1" ]; then
-    echo "Error: Coverage percentage not provided"
+COVERAGE=$1
+BADGE_TYPE=${2:-"unit"}
+
+# Get first line number of the badge
+LINE_NUM=$(cat -n README.md | grep -i "${BADGE_TYPE} coverage" | head -1 | awk '{print $1}')
+
+if [ -z "$LINE_NUM" ]; then
+    echo "Error: Could not find ${BADGE_TYPE} coverage badge in README.md"
     exit 1
 fi
 
-COVERAGE=$1
-BADGE_TYPE=${2:-"combined"}
-
-# Parse flags
-NO_COMMIT=false
-NO_PUSH=false
-
-for arg in "$@"; do
-    if [ "$arg" = "--no-commit" ]; then
-        NO_COMMIT=true
-    elif [ "$arg" = "--no-push" ]; then
-        NO_PUSH=true
-    fi
-done
-
-# Determine badge color
+# Get color
 if (( $(echo "$COVERAGE >= 80" | bc -l) )); then
     COLOR="brightgreen"
 elif (( $(echo "$COVERAGE >= 50" | bc -l) )); then
@@ -35,138 +25,15 @@ else
     COLOR="red"
 fi
 
-# Create different badge URLs and markdown format based on type
-if [ "$BADGE_TYPE" = "bdd" ]; then
-    BADGE_URL="https://img.shields.io/badge/BDD_Coverage-${COVERAGE}%-${COLOR}?style=flat-square"
-    BADGE_MARKDOWN="[![BDD Coverage](${BADGE_URL})](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)"
-    SEARCH_PATTERN="BDD_Coverage-.*-.*?style=flat-square"
-elif [ "$BADGE_TYPE" = "unit" ]; then
-    BADGE_URL="https://img.shields.io/badge/Unit_Coverage-${COVERAGE}%-${COLOR}?style=flat-square"
-    BADGE_MARKDOWN="[![Unit Coverage](${BADGE_URL})](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)"
-    SEARCH_PATTERN="Unit_Coverage-.*-.*?style=flat-square"
-else
-    BADGE_URL="https://img.shields.io/badge/coverage-${COVERAGE}%-${COLOR}?style=flat-square"
-    BADGE_MARKDOWN="[![Coverage](${BADGE_URL})](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)"
-    SEARCH_PATTERN="coverage-.*-.*?style=flat-square"
-fi
+# Create badge markdown
+BADGE_TYPE_UPPER=$(echo "$BADGE_TYPE" | tr '[:lower:]' '[:upper:]')
+BADGE_MARKDOWN="[![${BADGE_TYPE_UPPER} Coverage](https://img.shields.io/badge/${BADGE_TYPE_UPPER}_Coverage-${COVERAGE}%-${COLOR}?style=flat-square)](https://gitea.arcodange.lab/arcodange/dance-lessons-coach)"
 
-# Clean up any malformed badge lines from previous runs
-# Remove lines starting with "nhttps://" or "https://" that aren't proper markdown
-sed -i.bak '/^nhttps:\/\/.*img.shields.io.*Coverage/d' README.md 2>/dev/null || true
-sed -i.bak '/^https:\/\/.*img.shields.io.*Coverage/d' README.md 2>/dev/null || true
-
-# Remove old duplicate badges for the specific type being updated
-if [ "$BADGE_TYPE" = "bdd" ] || [ "$BADGE_TYPE" = "unit" ]; then
-    # Remove all existing badges of this type before adding new one
-    sed -i.bak "/${BADGE_TYPE}_Coverage/d" README.md 2>/dev/null || true
-fi
-
-rm -f README.md.bak
-
-# Only update if coverage has actually changed
-if grep -q "${BADGE_TYPE}_Coverage-${COVERAGE}%" README.md || grep -q "coverage-${COVERAGE}%" README.md; then
-    echo "Coverage badge already up to date at ${COVERAGE}%"
-    exit 0
-fi
-
-# Also check if badge already exists with this coverage (more flexible pattern)
-if [ "$BADGE_TYPE" = "bdd" ] || [ "$BADGE_TYPE" = "unit" ]; then
-    # Capitalize first letter for badge name
-    if [ "$BADGE_TYPE" = "unit" ]; then
-        BADGE_NAME="Unit"
-    else
-        BADGE_NAME="BDD"
-    fi
-    if grep -q "\[!\[${BADGE_NAME} Coverage\].*${COVERAGE}%" README.md; then
-        echo "Coverage badge already exists at ${COVERAGE}%"
-        exit 0
-    fi
-fi
-
-# Cross-platform sed command
-# Detect if we're on macOS (BSD sed) or Linux (GNU sed)
-SED_CMD=""
+# Replace the line using sed
 if [[ "$(uname)" == "Darwin" ]]; then
-    # macOS - requires empty string after -i
-    SED_CMD="sed -i ''"
+    sed -i '' "${LINE_NUM}s|.*|${BADGE_MARKDOWN}|" README.md
 else
-    # Linux - standard GNU sed
-    SED_CMD="sed -i"
+    sed -i "${LINE_NUM}s|.*|${BADGE_MARKDOWN}|" README.md
 fi
 
-# Update README - handle both old and new badge formats
-if [ "$BADGE_TYPE" = "bdd" ] || [ "$BADGE_TYPE" = "unit" ]; then
-    # For BDD/Unit badges, add them if they don't exist, or update if they do
-    if grep -q "${BADGE_TYPE}_Coverage" README.md; then
-        # Update existing badge with proper markdown format
-        $SED_CMD "s|^\[!\[${BADGE_TYPE} Coverage\].*|"${BADGE_MARKDOWN}"|" README.md
-    else
-        # Add new badge line after the License badge (more reliable reference)
-        # Use a more reliable approach with temporary file for cross-platform compatibility
-        TEMP_FILE=$(mktemp)
-        awk -v new_badge="${BADGE_MARKDOWN}" '{
-            if ($0 ~ /\[!\[License\].*license-MIT-green/) {
-                print $0
-                print new_badge
-            } else {
-                print $0
-            }
-        }' README.md > "$TEMP_FILE"
-        mv "$TEMP_FILE" README.md
-    fi
-else
-    # For combined coverage, use the original logic
-    $SED_CMD "s|^\[!\[Coverage\].*|"${BADGE_MARKDOWN}"|" README.md
-fi
-
-# Set up git
-git config --global user.name "CI Bot"
-git config --global user.email "ci@arcodange.fr"
-
-# Set up credentials using Gitea token
-if [ -n "$PACKAGES_TOKEN" ]; then
-    git config --global credential.helper store
-    echo "https://${PACKAGES_TOKEN}@gitea.arcodange.lab" > ~/.git-credentials
-fi
-
-git add README.md
-
-# Skip commit if --no-commit flag is set
-if [ "$NO_COMMIT" = true ]; then
-    echo "Skipping git commit due to --no-commit flag"
-    echo "Coverage badge updated to ${COVERAGE}% in README.md (not committed)"
-    exit 0
-fi
-
-if git commit -m "🤖 chore: update coverage badge to ${COVERAGE}% [skip ci]"; then
-    # Skip push if --no-push flag is set
-    if [ "$NO_PUSH" = true ]; then
-        echo "Skipping git push due to --no-push flag"
-        echo "Coverage badge updated to ${COVERAGE}% and committed locally"
-        exit 0
-    fi
-    
-    # Try push with retry logic for race conditions
-    for i in 1 2 3; do
-        if git push; then
-            echo "Successfully updated coverage badge to ${COVERAGE}%"
-            # Update local repo to the new HEAD after successful push
-            git fetch origin
-            git reset --hard origin/${GITHUB_REF_NAME:-${CI_COMMIT_REF_NAME:-main}}
-            exit 0
-        else
-            echo "Push attempt $i failed, retrying..."
-            if [ $i -eq 3 ]; then
-                echo "Final push attempt failed - another job may have updated the badge"
-                git pull --rebase || true
-                git push || echo "Recovery push also failed"
-                # Ensure we're on the latest commit even if push failed
-                git fetch origin
-                git reset --hard origin/${GITHUB_REF_NAME:-${CI_COMMIT_REF_NAME:-main}}
-            fi
-            sleep 2
-        fi
-    done
-else
-    echo "No coverage change to commit"
-fi
+echo "Updated ${BADGE_TYPE} coverage badge to ${COVERAGE}% (line ${LINE_NUM})"