Merge concept version of database-lib

Closes https://git.gfz-potsdam.de/dynamicexposure/collaboration/-/issues/488

\approve @ds @shinde @tara

databaselib/database.py

@@ -24,17 +24,32 @@ logger = logging.getLogger()
 
 
 class AbstractDatabase(abc.ABC):
+    """
+    The AbstractDatabase class represents any database. It manages the
+    database connection and cursor.
+
+    Attributes:
+        connection:
+            Database connection.
+        cursor:
+            Database cursor.
+    """
+
     def __init__(self):
         self.connection = None
         self.cursor = None
 
     @abc.abstractmethod
     def connect(self):
+        """
+        Abstract connection to the database.
+        """
+
         pass
 
     def commit_and_close(self):
         """
-        Commits the executed statements and closes the database connection
+        Commits the executed statements and closes the database connection.
         """
 
         self.connection.commit()
@@ -42,8 +57,9 @@ class AbstractDatabase(abc.ABC):
 
     def close(self):
         """
-        Closes the database connection
+        Closes the database connection.
         """
+
         self.connection.close()
 
 
@@ -126,7 +142,40 @@ class SpatialiteDatabase(AbstractDatabase):
         self.cursor = self.connection.cursor()
 
 
-class PostgisDatabase(AbstractDatabase):
+class PostGISDatabase(AbstractDatabase):
+    """
+    The PostgisDatabase class represents a Postgis database. It manages the
+    database connection and cursor.
+
+    Args:
+        host (str):
+            Host of the database.
+        dbname (str):
+            Name of the database.
+        port (str):
+            Port of the database.
+        username (str):
+            Username for the database connection.
+        password (str):
+            Password for the database connection.
+
+    Attributes:
+        host (str):
+            Host of the database.
+        dbname (str):
+            Name of the database.
+        port (str):
+            Port of the database.
+        username (str):
+            Username for the database connection.
+        password (str):
+            Password for the database connection.
+        connection (psycopg2.Connection):
+            Database connection.
+        cursor (psycopg2.Cursor):
+            Database cursor.
+    """
+
     def __init__(self, host, dbname, port, username, password):
         super().__init__()
         self.host = host
@@ -140,6 +189,7 @@ class PostgisDatabase(AbstractDatabase):
         Create a database connection and a cursor with psycopg2 with the
         given credentials and include the connection and cursor as new attributes.
         """
+
         connection_string = (
             f"host={self.host} "
             f"dbname={self.dbname} "