Add PostgresSubprocessException and refactor database initialization logic

- Introduced PostgresSubprocessException to handle errors during PostgreSQL subprocess execution.
- Refactored PostgresDatabaseProvider to improve schema initialization script discovery.
- Enhanced error handling for psql command execution, including logging of output and errors.
- Implemented methods to find the schema initialization script and the psql executable path.

Jellyfin.Server/scripts/Linux/Weekly-Performance-Monitor.sh

@@ -91,7 +91,8 @@ done
 
 set -e # Exit on error
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
-PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
+SQL_DIR="$PROJECT_ROOT/scripts/sql"
 
 # Load database configuration
 source "./db-config.sh"
@@ -116,24 +117,15 @@ invoke_diagnostic_report() {
     local output_file="$1"
     write_color_output "\nRunning comprehensive diagnostics..." "$CYAN"
 
-    if PGPASSWORD=$DB_PASS $PSQL_PATH -h $DB_HOST -p $DB_PORT -U $DB_USER -d $DB_NAME -f "$PROJECT_ROOT/sql/diagnostics.sql" > "$output_file" 2>&1; then
+    run_sql_files_from_dir "$SQL_DIR/diagnostics" "$output_file"
+
+    if [ $? -eq 0 ]; then
         write_color_output "[OK] Diagnostics completed: $output_file" "$GREEN"
     else
         write_color_output "[WARN] Diagnostics completed with warnings" "$YELLOW"
     fi
 }
 
-invoke_query_analysis() {
-    local output_file="$1"
-    write_color_output "\nAnalyzing slow queries..." "$CYAN"
-
-    if PGPASSWORD=$DB_PASS $PSQL_PATH -h $DB_HOST -p $DB_PORT -U $DB_USER -d $DB_NAME -f "$PROJECT_ROOT/sql/query-analysis.sql" > "$output_file" 2>&1; then
-        write_color_output "[OK] Query analysis completed: $output_file" "$GREEN"
-    else
-        write_color_output "[WARN] Query analysis completed with warnings" "$YELLOW"
-    fi
-}
-
 get_index_usage_stats() {
     local output_file="$1"
     write_color_output "\nGathering index usage statistics..." "$CYAN"
@@ -269,7 +261,6 @@ Week Number: $(get_week_number)
 
 REPORTS GENERATED:
  * diagnostics_$timestamp.txt           : Full diagnostic report
- * query_analysis_$timestamp.txt        : Slow query analysis
  * index_usage_$timestamp.txt           : Index usage statistics
  * table_sizes_$timestamp.txt           : Table size and bloat info
  * summary_$timestamp.txt               : This summary
@@ -312,6 +303,33 @@ EOF
     write_color_output "[OK] Summary generated: $summary_file" "$GREEN"
 }
 
+# ============================================================================
+# Helper Functions
+# ============================================================================
+
+run_sql_files_from_dir() {
+    local sql_dir="$1"
+    local output_file="$2"
+    
+    if [ ! -d "$sql_dir" ]; then
+        write_color_output "[ERROR] Directory not found: $sql_dir" "$RED"
+        return 1
+    fi
+
+    # Clear the output file before running scripts
+    > "$output_file"
+
+    for sql_file in "$sql_dir"/*.sql; do
+        echo -e "\n---\n-- Executing: $(basename "$sql_file")\n---\n" >> "$output_file"
+        write_color_output "Running SQL file: $(basename "$sql_file")" "$CYAN"
+        if PGPASSWORD=$DB_PASS $PSQL_PATH -h $DB_HOST -p $DB_PORT -U $DB_USER -d $DB_NAME -f "$sql_file" >> "$output_file" 2>&1; then
+            write_color_output "[OK] Successfully executed $(basename "$sql_file")" "$GREEN"
+        else
+            write_color_output "[WARN] Completed with warnings: $(basename "$sql_file")" "$YELLOW"
+        fi
+    done
+}
+
 # ============================================================================
 # Main Execution
 # ============================================================================
@@ -343,10 +361,6 @@ fi
 diagnostics_file="$report_dir/diagnostics_$timestamp.txt"
 invoke_diagnostic_report "$diagnostics_file"
 
-# Run query analysis
-query_analysis_file="$report_dir/query_analysis_$timestamp.txt"
-invoke_query_analysis "$query_analysis_file"
-
 # Gather index usage stats
 index_usage_file="$report_dir/index_usage_$timestamp.txt"
 get_index_usage_stats "$index_usage_file"