diff --git a/lib/common.sh b/lib/common.sh
index 39529d9..1d94aef 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -14,7 +14,7 @@ readonly FILESTORE_SUBPATH="var/lib/odoo/filestore"
 
 check_required_commands() {
     local missing=()
-    for cmd in docker compose sudo rsync; do
+    for cmd in docker compose sudo rsync yq; do
         if ! command -v "$cmd" &>/dev/null; then
             missing+=("$cmd")
         fi
@@ -100,7 +100,83 @@ exec_python_script_in_odoo_shell() {
     run_compose --debug run "$service_name" shell -d "$db_name" --no-http --stop-after-init < "$python_script"
 }
 
+# Classifies missing modules into 4 categories based on the known_changes.yaml
+# files from each traversed version (from ORIGIN_VERSION+1 to FINAL_VERSION).
+# The following global arrays are populated:
+#   addons_obsolete      : modules that became obsolete
+#   addons_core          : modules merged into Odoo Core
+#   addons_renamed       : renamed modules (format "old_name -> new_name")
+#   addons_truly_missing : modules that are genuinely missing
+#
+# Prerequisites: ORIGIN_VERSION and FINAL_VERSION must be exported.
+classify_missing_addons() {
+    local missing_addons_raw="$1"
+
+    addons_obsolete=()
+    addons_core=()
+    addons_renamed=()
+    addons_truly_missing=()
+
+    # Convert the string into an array (one entry per line)
+    local -a missing=()
+    while IFS= read -r line; do
+        [[ -n "$line" ]] && missing+=("$line")
+    done <<< "$missing_addons_raw"
+
+    if [[ ${#missing[@]} -eq 0 ]]; then
+        return 0
+    fi
+
+    # Build lookup tables from all known_changes.yaml files in traversed versions
+    local -A known_obsolete=()
+    local -A known_core=()
+    local -A known_renamed=()
+
+    local versions_path="${PROJECT_ROOT}/versions"
+    local v
+    for v in $(seq $((ORIGIN_VERSION + 1)) "$FINAL_VERSION"); do
+        local yaml_file="${versions_path}/${v}.0/known_changes.yaml"
+        [[ -f "$yaml_file" ]] || continue
+
+        local mod
+        while IFS= read -r mod; do
+            [[ -n "$mod" && "$mod" != "null" ]] && known_obsolete["$mod"]=1
+        done < <(yq '.obsolete[]?' "$yaml_file" 2>/dev/null)
+
+        while IFS= read -r mod; do
+            [[ -n "$mod" && "$mod" != "null" ]] && known_core["$mod"]=1
+        done < <(yq '.merged_in_core[]?' "$yaml_file" 2>/dev/null)
+
+        local count
+        count=$(yq '.renamed | length' "$yaml_file" 2>/dev/null)
+        if [[ "$count" =~ ^[0-9]+$ && "$count" -gt 0 ]]; then
+            local i
+            for ((i = 0; i < count; i++)); do
+                local old new
+                old=$(yq ".renamed[$i].old" "$yaml_file" 2>/dev/null)
+                new=$(yq ".renamed[$i].new" "$yaml_file" 2>/dev/null)
+                [[ -n "$old" && "$old" != "null" ]] && known_renamed["$old"]="$new"
+            done
+        fi
+    done
+
+    # Classify each missing module
+    local mod
+    for mod in "${missing[@]}"; do
+        if [[ -n "${known_obsolete[$mod]:-}" ]]; then
+            addons_obsolete+=("$mod")
+        elif [[ -n "${known_core[$mod]:-}" ]]; then
+            addons_core+=("$mod")
+        elif [[ -n "${known_renamed[$mod]:-}" ]]; then
+            addons_renamed+=("${mod} -> ${known_renamed[$mod]}")
+        else
+            addons_truly_missing+=("$mod")
+        fi
+    done
+}
+
 export PROJECT_ROOT DATASTORE_PATH FILESTORE_SUBPATH
 export -f log_info log_warn log_error log_step confirm_or_exit
 export -f check_required_commands
 export -f query_postgres_container copy_database copy_filestore run_compose exec_python_script_in_odoo_shell
+export -f classify_missing_addons
diff --git a/scripts/prepare_db.sh b/scripts/prepare_db.sh
index 76dc3d1..c8e5f0d 100755
--- a/scripts/prepare_db.sh
+++ b/scripts/prepare_db.sh
@@ -60,9 +60,31 @@ echo "Retrieve missing addons..."
 missing_addons=$(query_postgres_container "$SQL_MISSING_ADDONS" "$DB_NAME")
 
 log_step "ADD-ONS CHECK"
-echo "Installed add-ons not available in final Odoo version:"
-echo "$missing_addons"
-confirm_or_exit "Do you accept to migrate with these add-ons still installed?"
+classify_missing_addons "$missing_addons"
+
+if [[ ${#addons_obsolete[@]} -gt 0 ]]; then
+    log_info "Obsolete modules (${#addons_obsolete[@]}):"
+    printf "%s\n" "${addons_obsolete[@]}"
+    echo ""
+fi
+if [[ ${#addons_core[@]} -gt 0 ]]; then
+    log_info "Merged into Odoo Core (${#addons_core[@]}):"
+    printf "%s\n" "${addons_core[@]}"
+    echo ""
+fi
+if [[ ${#addons_renamed[@]} -gt 0 ]]; then
+    log_info "Renamed modules (${#addons_renamed[@]}):"
+    printf "%s\n" "${addons_renamed[@]}"
+    echo ""
+fi
+if [[ ${#addons_truly_missing[@]} -gt 0 ]]; then
+    log_warn "Truly missing modules (${#addons_truly_missing[@]}):"
+    printf "%s\n" "${addons_truly_missing[@]}"
+    echo ""
+    confirm_or_exit "Do you accept to migrate with these add-ons truly missing?"
+else
+    log_info "No truly missing modules — all accounted for."
+fi
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 PYTHON_SCRIPT="${SCRIPT_DIR}/lib/python/check_views.py"
diff --git a/upgrade.sh b/upgrade.sh
index 69a0921..0b2f7a2 100755
--- a/upgrade.sh
+++ b/upgrade.sh
@@ -31,8 +31,10 @@ fi
 
 check_required_commands
 
-readonly ORIGIN_VERSION="$1"
-readonly FINAL_VERSION="$2"
+export ORIGIN_VERSION="$1"
+readonly ORIGIN_VERSION
+export FINAL_VERSION="$2"
+readonly FINAL_VERSION
 readonly ORIGIN_DB_NAME="$3"
 readonly ORIGIN_SERVICE_NAME="$4"
 
diff --git a/versions/13.0/known_changes.yaml b/versions/13.0/known_changes.yaml
new file mode 100644
index 0000000..9a2252e
--- /dev/null
+++ b/versions/13.0/known_changes.yaml
@@ -0,0 +1,10 @@
+# Modules that became obsolete in version 13.0
+obsolete: []
+
+# Modules merged into Odoo Core in version 13.0
+merged_in_core: []
+
+# Modules renamed in version 13.0
+renamed: []
+#  - old: old_name
+#    new: new_name
diff --git a/versions/14.0/known_changes.yaml b/versions/14.0/known_changes.yaml
new file mode 100644
index 0000000..22d763f
--- /dev/null
+++ b/versions/14.0/known_changes.yaml
@@ -0,0 +1,10 @@
+# Modules that became obsolete in version 14.0
+obsolete: []
+
+# Modules merged into Odoo Core in version 14.0
+merged_in_core: []
+
+# Modules renamed in version 14.0
+renamed: []
+#  - old: old_name
+#    new: new_name
diff --git a/versions/15.0/known_changes.yaml b/versions/15.0/known_changes.yaml
new file mode 100644
index 0000000..2f2a3bb
--- /dev/null
+++ b/versions/15.0/known_changes.yaml
@@ -0,0 +1,10 @@
+# Modules that became obsolete in version 15.0
+obsolete: []
+
+# Modules merged into Odoo Core in version 15.0
+merged_in_core: []
+
+# Modules renamed in version 15.0
+renamed: []
+#  - old: old_name
+#    new: new_name
diff --git a/versions/16.0/known_changes.yaml b/versions/16.0/known_changes.yaml
new file mode 100644
index 0000000..0efaca1
--- /dev/null
+++ b/versions/16.0/known_changes.yaml
@@ -0,0 +1,10 @@
+# Modules that became obsolete in version 16.0
+obsolete: []
+
+# Modules merged into Odoo Core in version 16.0
+merged_in_core: []
+
+# Modules renamed in version 16.0
+renamed: []
+#  - old: old_name
+#    new: new_name
diff --git a/versions/17.0/known_changes.yaml b/versions/17.0/known_changes.yaml
new file mode 100644
index 0000000..6d68470
--- /dev/null
+++ b/versions/17.0/known_changes.yaml
@@ -0,0 +1,10 @@
+# Modules that became obsolete in version 17.0
+obsolete: []
+
+# Modules merged into Odoo Core in version 17.0
+merged_in_core: []
+
+# Modules renamed in version 17.0
+renamed: []
+#  - old: old_name
+#    new: new_name
diff --git a/versions/18.0/known_changes.yaml b/versions/18.0/known_changes.yaml
new file mode 100644
index 0000000..d7678ed
--- /dev/null
+++ b/versions/18.0/known_changes.yaml
@@ -0,0 +1,10 @@
+# Modules that became obsolete in version 18.0
+obsolete: []
+
+# Modules merged into Odoo Core in version 18.0
+merged_in_core: []
+
+# Modules renamed in version 18.0
+renamed: []
+#  - old: old_name
+#    new: new_name