v0.2.18 - Clean up configuration system: remove active_config VIEW, database_location field, fix double slash in paths, and ensure database_path reflects actual path used

- Add --database-path/-D command line parameter for database override
- Store actual database and config file paths as metadata in config tables
- Fix circular dependency by making command line overrides runtime-only
- Support multiple relay instances with separate databases and configurations
- Clean path normalization removes redundant ./ prefixes
- New fields: database_location and config_location for tracking actual usage

relay.pid

@@ -1 +1 @@
-949770
+960728

src/main.c

@@ -3132,6 +3132,86 @@ int main(int argc, char* argv[]) {
         return 1;
     }
     
+    // Update database_path field to reflect actual database path used
+    if (database_path_override) {
+        // Convert to absolute path and normalize
+        char actual_db_path[1024];
+        if (database_path_override[0] == '/') {
+            // Already absolute
+            strncpy(actual_db_path, database_path_override, sizeof(actual_db_path) - 1);
+        } else {
+            // Make absolute by prepending current working directory
+            char cwd[1024];
+            if (getcwd(cwd, sizeof(cwd))) {
+                // Handle the case where path starts with ./
+                const char* clean_path = database_path_override;
+                if (strncmp(database_path_override, "./", 2) == 0) {
+                    clean_path = database_path_override + 2;
+                }
+                
+                // Ensure we don't exceed buffer size
+                int written = snprintf(actual_db_path, sizeof(actual_db_path), "%s/%s", cwd, clean_path);
+                if (written >= (int)sizeof(actual_db_path)) {
+                    log_warning("Database path too long, using original path");
+                    strncpy(actual_db_path, database_path_override, sizeof(actual_db_path) - 1);
+                    actual_db_path[sizeof(actual_db_path) - 1] = '\0';
+                }
+            } else {
+                strncpy(actual_db_path, database_path_override, sizeof(actual_db_path) - 1);
+            }
+        }
+        actual_db_path[sizeof(actual_db_path) - 1] = '\0';
+        
+        // Update the database_path configuration to reflect actual path used
+        if (set_database_config("database_path", actual_db_path, "system") == 0) {
+            log_info("Updated database_path configuration with actual path used");
+        } else {
+            log_warning("Failed to update database_path configuration");
+        }
+    }
+    
+    // Store metadata about configuration file path used
+    if (strlen(g_config_manager.config_file_path) > 0) {
+        // Convert to absolute path and normalize (fix double slash issue)
+        char actual_config_path[1024];
+        if (g_config_manager.config_file_path[0] == '/') {
+            // Already absolute - use as-is
+            strncpy(actual_config_path, g_config_manager.config_file_path, sizeof(actual_config_path) - 1);
+        } else {
+            // Make absolute by prepending current working directory
+            char cwd[1024];
+            if (getcwd(cwd, sizeof(cwd))) {
+                // Handle the case where path starts with ./
+                const char* clean_path = g_config_manager.config_file_path;
+                if (strncmp(g_config_manager.config_file_path, "./", 2) == 0) {
+                    clean_path = g_config_manager.config_file_path + 2;
+                }
+                
+                // Remove any trailing slash from cwd to avoid double slash
+                size_t cwd_len = strlen(cwd);
+                if (cwd_len > 0 && cwd[cwd_len - 1] == '/') {
+                    cwd[cwd_len - 1] = '\0';
+                }
+                
+                // Remove any leading slash from clean_path to avoid double slash
+                if (clean_path[0] == '/') {
+                    clean_path++;
+                }
+                
+                snprintf(actual_config_path, sizeof(actual_config_path), "%s/%s", cwd, clean_path);
+            } else {
+                strncpy(actual_config_path, g_config_manager.config_file_path, sizeof(actual_config_path) - 1);
+            }
+        }
+        actual_config_path[sizeof(actual_config_path) - 1] = '\0';
+        
+        if (set_database_config("config_location", actual_config_path, "system") == 0) {
+            log_info("Stored configuration location metadata");
+        } else {
+            log_warning("Failed to store configuration location metadata");
+        }
+    }
+    
     // Apply command line overrides AFTER configuration system is initialized
     if (port != DEFAULT_PORT) {
         log_info("Applying port override from command line");

src/sql_schema.h

@@ -6,7 +6,7 @@
 #define SQL_SCHEMA_H
 
 /* Schema version constant */
-#define EMBEDDED_SCHEMA_VERSION "3"
+#define EMBEDDED_SCHEMA_VERSION "4"
 
 /* Embedded SQL schema as C string literal */
 static const char* const EMBEDDED_SCHEMA_SQL = 
@@ -14,7 +14,7 @@ static const char* const EMBEDDED_SCHEMA_SQL =
 -- SQLite schema for storing Nostr events with JSON tags support\n\
 \n\
 -- Schema version tracking\n\
-PRAGMA user_version = 3;\n\
+PRAGMA user_version = 4;\n\
 \n\
 -- Enable foreign key support\n\
 PRAGMA foreign_keys = ON;\n\
@@ -267,20 +267,6 @@ BEGIN\n\
     VALUES (NEW.key, OLD.value, NEW.value, 'system', 'configuration update');\n\
 END;\n\
 \n\
--- Active Configuration View\n\
-CREATE VIEW active_config AS\n\
-SELECT\n\
-    key,\n\
-    value,\n\
-    description,\n\
-    config_type,\n\
-    data_type,\n\
-    requires_restart,\n\
-    updated_at\n\
-FROM config\n\
-WHERE config_type IN ('system', 'user')\n\
-ORDER BY config_type, key;\n\
-\n\
 -- Runtime Statistics View\n\
 CREATE VIEW runtime_stats AS\n\
 SELECT\n\