Add workaround for duplicate session key exception

Russell keeps hitting this first thing in the morning. Hopefully this
will help.

ui/src/pandas/core/SessionConfig.java

@@ -0,0 +1,25 @@
+package pandas.core;
+
+import org.springframework.context.annotation.*;
+import org.springframework.core.type.AnnotatedTypeMetadata;
+import org.springframework.session.jdbc.OracleJdbcIndexedSessionRepositoryCustomizer;
+
+@Configuration
+public class SessionConfig {
+    // This is a workaround for an exception we get seemingly randomly hit occasionally when sessions
+    // are first created and the session insert fails with duplicate key exception.
+    // Seems to be a relatively common issue with Spring Session: https://stackoverflow.com/a/69540376
+    @Bean
+    @Conditional(OracleDatabaseCondition.class)
+    public OracleJdbcIndexedSessionRepositoryCustomizer oracleJdbcIndexedSessionRepositoryCustomizer() {
+        return new OracleJdbcIndexedSessionRepositoryCustomizer();
+    }
+
+    public static class OracleDatabaseCondition implements Condition {
+        @Override
+        public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
+            String jdbcUrl = context.getEnvironment().getProperty("spring.datasource.url");
+            return jdbcUrl != null && jdbcUrl.startsWith("jdbc:oracle:");
+        }
+    }
+}