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diff --git a/docs/source/database/index.rst b/docs/source/database/index.rst
new file mode 100644
index 0000000000000000000000000000000000000000..fd113adc501f350627649f4d4a9907ee210bca62
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@@ -0,0 +1,45 @@
+#########################
+Autosubmit storage system
+#########################
+
+Introduction
+------------
+
+Autosubmit stores information about its experiments and workflows in SQLite databases and as serialized Python objects (pickle files). These are distributed through the local filesystem, where Autosubmit is installed and runs. There is one central database that supports the core functionality of experiments in Autosubmit. There are other auxiliary databases consumed by Autosubmit and the Autosubmit API, that store finer-grained experiment information. The name and location of the central database are defined in the .autosubmitrc config file while the other auxiliary DBs have a predefined name. There are also log files with important information about experiment execution and some other relevant information such as experiment job statuses, timestamps, error messages among other things inside these files.
+
+.. figure:: fig/Autosubmit Databases-highlevel.png
+   :name: simple
+   :width: 100%
+   :align: center
+   :alt: High level view of the Autosubmit storage system
+
+Core databases
+---------------
+
+* Autosubmit's main database: The default name is autosubmit.db, but the name and location can be customized in .autosubmitrc. Written and read by Autosubmit.
+* as_times.db: Used by the Autosubmit API. This database is deprecated since Autosubmit version 3.x. It is currently being kept for backward compatibility. Written and read by worker running periodically.
+
+Auxiliary databases
+--------------------
+
+These databases complement the Core database previously described for different purposes, some of them are centralized in the $AS_METADATA_FOLDER directory (defined in the .autosubmitrc config file) while others are present inside each experiment folder:
+Databases present in $AS_METADATA_FOLDER:
+
+* /graph/graph_data_xxxx.db: used by the GUI to optimize the generation of the graph visualization. Populated by a worker running periodically.
+* /structures/structure_xxxx.db: experiment dependencies stored as an edge list. Used in the GUI and populated by a worker running periodically.
+* /data/job_data_xxxx.db: Stores incremental historical job data information for a given experiment and also some other metrics, filled by Autosubmit during the job handling, there is one per experiment.
+* /test/status.db: Stores status of the partition where all Autosubmit DBs and experiment files are stored, populated by a worker running periodically.
+
+Note that xxxx is the ID of a given experiment, and also that the root path ($AS_METADATA_FOLDER) is determined by the configuration defined in .autosubmitrc config file, under the path defined there, the folder mentioned above will be created.
+Databases in each experiment folder:
+
+* job_packages_xxxx.db: Stores the wrappers defined in the experiment, if no wrapper is defined then it may not exist or be empty.
+* structure_xxxx.db: Now deprecated, present in older experiments, same structure and purpose as the one described in the previous section.
+
+Other files
+-----------
+
+Python Pickle files (.pkl): it has the defined job list of the experiment with state information of all of them. So in the event of a crash or the user stops the experiment, Autosubmit can resume from the last valid state stored in this file.
+Update lists: to change the status of experiment jobs without stopping Autosubmit, it is a text file.
+
+These files are present in the experiment folder.
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 2897beb6de61075a5c917fddc96add7e395e4be9..e5d8034cd06d7c66f36033f43ff06997df4c5b3e 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -65,6 +65,12 @@ Welcome to autosubmit's documentation!
 
    /moduledoc/index
 
+.. toctree::
+   :caption: Database Documentation
+   :maxdepth: 1
+   :hidden:
+
+  /database/index
 
 Autosubmit is a Python software to manage complicated workflows on HPC platforms.
 
diff --git a/test/regression/tests_runner.py b/test/regression/tests_runner.py
index 54d38624e40ceb13a7ea11fd624324c87dca0519..13cb8fc056ca3daea2b2f6cbc3ac3af96fb036c3 100644
--- a/test/regression/tests_runner.py
+++ b/test/regression/tests_runner.py
@@ -79,6 +79,7 @@ def run(current_experiment_id, only_list=None, exclude_list=None, max_threads=5)
     tests_parser.optionxform = str
     tests_parser.read(tests_parser_file)
 
+
     # Resetting the database
     clean_database(db_path)
     create_database()