updates CMake configuration for SQLite; sqlite: open or create table function.

src/db/db.h

@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: MIT */
+/* Copyright (c) 2026 Oleksandr Zhylin */
+
+#ifndef DB_H
+#define DB_H
+#include "../main.h"
+#include <stdint.h>
+
+/* Auth */
+
+typedef struct {
+  char *name;
+  char *pass;
+} i_auth_t;
+
+typedef struct {
+  char privileges;
+  uint32_t uid;
+} o_auth_t;
+
+/* Get file */
+
+typedef struct {
+  uint32_t id;
+  uint32_t user_id;
+  char name[FILE_NAME_LEN];
+} i_get_file_db;
+
+enum sort_direction { ASC, DESC };
+enum sort_by { ID, NAME, CREATED_AT, USER_ID };
+
+typedef struct {
+  uint32_t user_id; // TODO: implement
+  char name[FILE_NAME_LEN];    // TODO: implement
+  uint32_t limit;
+  uint32_t offset;
+  enum sort_by sort_by;
+  enum sort_direction sort_direction;
+} i_get_files_db;
+
+typedef struct {
+  char uname[UNAME_LEN];
+  char pass[PASS_LEN];
+  char email[EMAIL_LEN];
+} i_db_user_create;
+
+int32_t init_db_connection();
+int32_t db_save_file(session *s);
+int32_t db_user_auth(i_auth_t *credentials, o_auth_t *response);
+s_file_t *db_get_file(i_get_file_db *arg);
+uint64_t db_get_files_data(i_get_files_db *arg, fl_t **fl_start,
+                           uint64_t *full_count);
+int32_t db_user_create(i_db_user_create *);
+#endif