And then, right after the `yield`, we unload the model. This code will be executed **after** the application **finishes handling requests**, right before the *shutdown*. This could, for example, release resources like memory or a GPU.

!!! tip

The [Alias] type now has an [Rhs] method that returns the type on the
right-hand side of its declaration: given `type A = B`, the `Rhs` of A

									<la:message key="labels.upgrade_data_migration" />
								</h3>
							</div>
							<div class="card-body">
								<div class="form-group row">
									<label for="targetVersion" class="col-sm-3 text-sm-right col-form-label"><la:message
											key="labels.target_version"
										/></label>
									<div class="col-sm-9">
										<la:errors property="targetVersion" />

				// Subsequent reads will reuse this buffer.
				p.buf[bufIdx] = make([]byte, p.shardSize)
			}
			// For the last shard, the shardsize might be less than previous shard sizes.
			// Hence the following statement ensures that the buffer size is reset to the right size.
			p.buf[bufIdx] = p.buf[bufIdx][:p.shardSize]
			n, err := rr.ReadAt(p.buf[bufIdx], p.offset)
			if err != nil {
				switch {

## Create the tables

In this case, we are creating the tables in the same Python file, but in production, you would probably want to create them with Alembic, integrated with migrations, etc.

Here, this section would run directly, right before starting your **FastAPI** application.

* Create an `engine`.
* Create all the tables from the `metadata` object.

```Python hl_lines="25-28"
{!../../../docs_src/async_sql_databases/tutorial001.py!}
```

This works the same way as with Pydantic models. And it is actually achieved in the same way underneath, using Pydantic.

!!! info
    Keep in mind that dataclasses can't do everything Pydantic models can do.

    So, you might still need to use Pydantic models.

    But if you have a bunch of dataclasses laying around, this is a nice trick to use them to power a web API using FastAPI. 🤓

## Dataclasses in `response_model`

    api(project(":compiler:fir:entrypoint"))
    api(project(":analysis:low-level-api-fir"))
    api(project(":analysis:analysis-api"))
    api(project(":analysis:analysis-api-impl-base"))
    api(project(":analysis:light-classes-base"))
    api(project(":compiler:backend.common.jvm"))
    implementation(project(":compiler:cli-base"))
    implementation(project(":compiler:backend"))
    implementation(project(":compiler:backend.jvm.entrypoint"))

            return if (psi.valueParameters.isNotEmpty()) {
                psi.valueParameters.map { KtFe10PsiValueParameterSymbol(it, analysisContext) }
            } else {
                // There might be implicit 'it'
                descriptor?.valueParameters.orEmpty().map { KtFe10DescValueParameterSymbol(it, analysisContext) }
            }
        }

    override val hasStableParameterNames: Boolean

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

<idea-plugin xmlns:xi="http://www.w3.org/2001/XInclude">
  <xi:include href="/META-INF/analysis-api/analysis-api-impl-base.xml"/>
  <xi:include href="/META-INF/analysis-api/low-level-api-fir.xml"/>
  <xi:include href="/META-INF/analysis-api/symbol-light-classes.xml"/>

  <xi:include href="/META-INF/extensions/compiler.xml"/>

  <extensions defaultExtensionNs="com.intellij">
    <projectService