Drop support for ORACLE (again) (#18)

DEVELOPING.md

@@ -223,15 +223,13 @@ Or use `pytest` directly:
 py.test
 ```
 
-### Running tests with PostgreSQL and ORACLE
+### Running tests with PostgreSQL
 
-In order to run the local tests with PostgreSQL or ORACLE you'll need to have a local
-instance of this database running.
-The easiest way to do this using a docker container.
+In order to run the local tests with PostgreSQL you'll need to have a local instance
+of this database running. The easiest way to do this using a docker container.
 
-For PostgreSQL using the official [`postgres`](https://hub.docker.com/_/postgres) image
-is recommended. Get the latest version on you local machine using (having docker
-installed):
+Using the official [`postgres`](https://hub.docker.com/_/postgres) image is recommended.
+Get the latest version on you local machine using (having docker installed):
 
 ```console
 docker pull postgres
@@ -243,25 +241,20 @@ and run the container with:
 docker run -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=test -p 5432:5432 -d postgres
 ```
 
-for ORACLE you can use the the [`gvenzl/oracle-xe`](https://hub.docker.com/r/gvenzl/oracle-xe) image:
-
-```console
-docker pull gvenzl/oracle-xe
-docker run -e ORACLE_RANDOM_PASSWORD=true -e APP_USER=ixmp4_test -e APP_USER_PASSWORD=ixmp4_test -p 1521:1521 -d gvenzl/oracle-xe
-```
-
-please note that you'll have to wait for a few seconds for the databases to be up and
+Please note that you'll have to wait for a few seconds for the databases to be up and
 running.
 
-The `tests/docker-compose.yml` file might help you accomplish all of this with a single command for your convenience.
+The `tests/docker-compose.yml` file might help you accomplish all of this with a single
+command for your convenience.
 
 ```console
 docker-compose -f tests/docker-compose.yml up
 ```
 
 ### Profiling
 
-Some tests will output profiler information to the `.profiles/` directory (using the `profiled` fixture). You can analyze these using `snakeviz`. For example:
+Some tests will output profiler information to the `.profiles/` directory (using the
+`profiled` fixture). You can analyze these using `snakeviz`. For example:
 
 ```bash
 snakeviz .profiles/test_add_datapoints_full_benchmark.prof

doc/source/devs/modules.rst

@@ -38,7 +38,7 @@ Package/Folder Structure
 Architecture
 ------------
 
-ixmp4 provides a Python API, a REST API and a compatibility layer for Oracle, Postgres and SQLite Databases.
+ixmp4 provides a Python API, a REST API and a compatibility layer for Postgres and SQLite Databases.
 The Python API can interact with databases directly or use the REST API of a compatible ixmp4 server instance.
 
 ::

doc/source/devs/tests.rst

@@ -24,17 +24,15 @@ Alternatively, use ``pytest`` directly:
 
    py.test
 
-Running tests with PostgreSQL and ORACLE
-----------------------------------------
+Running tests with PostgreSQL
+-----------------------------
 
-In order to run the local tests with PostgreSQL or ORACLE you'll need to have a local
-instance of this database running. The easiest way to do this is using a docker
-container. 
+In order to run the local tests with PostgreSQL you'll need to have a local instance of
+this database running. The easiest way to do this is using a docker container.
 
 The docker container of the database needs to be started first and then the tests can be
-run normally using pytest. If everything is working correctly, the tests for ORACLE or
-PostgreSQL should not be skipped.
-
+run normally using pytest. If everything is working correctly, the tests for PostgreSQL
+should not be skipped.
 
 For PostgreSQL using the official `postgres <https://hub.docker.com/_/postgres>`_ image
 is recommended. Get the latest version on your local machine using (having docker
@@ -50,17 +48,6 @@ and run the container with:
 
    docker run -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=test -p 5432:5432 -d postgres
 
-for ORACLE you can use the `gvenzl/oracle-xe`
-<https://hub.docker.com/r/gvenzl/oracle-xe>`_ image:
-
-.. code:: bash
-
-   docker pull gvenzl/oracle-xe
-   docker run -e ORACLE_RANDOM_PASSWORD=true -e APP_USER=ixmp4_test -e APP_USER_PASSWORD=ixmp4_test -p 1521:1521 -d gvenzl/oracle-xe
-
-please note that you'll have to wait for a few seconds for the databases to be up and
-running.
-
 In case there are any error messages during the start up of the container along those lines:
 
 .. code:: bash

ixmp4/data/db/iamc/datapoint/repository.py

@@ -87,8 +87,7 @@ class DataPointRepository(
 
     def __init__(self, *args, **kwargs) -> None:
         backend, *_ = args
-        # A different underlying database table
-        # needed to be used for oracle databases.
+        # A different table was used for ORACLE databases (deprecated since ixmp4 0.3.0)
         self.model_class = get_datapoint_model(backend.session)
 
         self.timeseries = TimeSeriesRepository(*args, **kwargs)