diff --git a/javascript/ql/lib/semmle/javascript/dataflow/internal/DataFlowNode.qll b/javascript/ql/lib/semmle/javascript/dataflow/internal/DataFlowNode.qll
index ba50b34d7dd..d6ba48d77cb 100644
--- a/javascript/ql/lib/semmle/javascript/dataflow/internal/DataFlowNode.qll
+++ b/javascript/ql/lib/semmle/javascript/dataflow/internal/DataFlowNode.qll
@@ -33,4 +33,10 @@ newtype TNode =
   TExceptionalInvocationReturnNode(InvokeExpr e) or
   TGlobalAccessPathRoot() or
   TTemplatePlaceholderTag(Templating::TemplatePlaceholderTag tag) or
-  TReflectiveParametersNode(Function f)
+  TReflectiveParametersNode(Function f) or
+  TForbiddenRecursionGuard() {
+    none() and
+    // We want to prune irrelevant models before materialising data flow nodes, so types contributed
+    // directly from CodeQL must expose their pruning info without depending on data flow nodes.
+    (any(ModelInput::TypeModel tm).isTypeUsed("") implies any())
+  }
diff --git a/javascript/ql/lib/semmle/javascript/frameworks/data/internal/ApiGraphModels.qll b/javascript/ql/lib/semmle/javascript/frameworks/data/internal/ApiGraphModels.qll
index b850a4acea0..7215bd71550 100644
--- a/javascript/ql/lib/semmle/javascript/frameworks/data/internal/ApiGraphModels.qll
+++ b/javascript/ql/lib/semmle/javascript/frameworks/data/internal/ApiGraphModels.qll
@@ -168,9 +168,20 @@ module ModelInput {
    * A unit class for adding additional type model rows from CodeQL models.
    */
   class TypeModel extends Unit {
+    /**
+     * Holds if any of the other predicates in this class might have a result
+     * for the given `type`.
+     *
+     * The implementation of this predicate should not depend on `DataFlow::Node`.
+     */
+    bindingset[type]
+    predicate isTypeUsed(string type) { none() }
+
     /**
      * Gets a data-flow node that is a source of the given `type`.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * This must not depend on API graphs, but ensures that an API node is generated for
      * the source.
      */
@@ -180,6 +191,8 @@ module ModelInput {
      * Gets a data-flow node that is a sink of the given `type`,
      * usually because it is an argument passed to a parameter of that type.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * This must not depend on API graphs, but ensures that an API node is generated for
      * the sink.
      */
@@ -188,6 +201,8 @@ module ModelInput {
     /**
      * Gets an API node that is a source or sink of the given `type`.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * Unlike `getASource` and `getASink`, this may depend on API graphs.
      */
     API::Node getAnApiNode(string type) { none() }
@@ -367,6 +382,8 @@ predicate isRelevantType(string type) {
   (
     Specific::isTypeUsed(type)
     or
+    any(TypeModel model).isTypeUsed(type)
+    or
     exists(TestAllModels t)
   )
   or
diff --git a/javascript/ql/test/library-tests/frameworks/data/test.expected b/javascript/ql/test/library-tests/frameworks/data/test.expected
index d9b9d7e18e2..39630269a33 100644
--- a/javascript/ql/test/library-tests/frameworks/data/test.expected
+++ b/javascript/ql/test/library-tests/frameworks/data/test.expected
@@ -79,6 +79,7 @@ taintFlow
 | test.js:269:10:269:31 | this.ba ... ource() | test.js:269:10:269:31 | this.ba ... ource() |
 | test.js:272:6:272:40 | new MyS ... ource() | test.js:272:6:272:40 | new MyS ... ource() |
 | test.js:274:6:274:39 | testlib ... eName() | test.js:274:6:274:39 | testlib ... eName() |
+| test.js:277:8:277:31 | "danger ... .danger | test.js:277:8:277:31 | "danger ... .danger |
 isSink
 | test.js:54:18:54:25 | source() | test-sink |
 | test.js:55:22:55:29 | source() | test-sink |
diff --git a/javascript/ql/test/library-tests/frameworks/data/test.ext.yml b/javascript/ql/test/library-tests/frameworks/data/test.ext.yml
index 8aec6766913..eed5c054fbf 100644
--- a/javascript/ql/test/library-tests/frameworks/data/test.ext.yml
+++ b/javascript/ql/test/library-tests/frameworks/data/test.ext.yml
@@ -11,6 +11,7 @@ extensions:
       - ['testlib', 'Member[ParamDecoratorSource].DecoratedParameter', 'test-source']
       - ['testlib', 'Member[getSource].ReturnValue', 'test-source']
       - ['(testlib)', 'Member[parenthesizedPackageName].ReturnValue', 'test-source']
+      - ['danger-constant', 'Member[danger]', 'test-source']
 
   - addsTo:
       pack: codeql/javascript-all
diff --git a/javascript/ql/test/library-tests/frameworks/data/test.js b/javascript/ql/test/library-tests/frameworks/data/test.js
index 97bb49f8cf7..71fd64e10f6 100644
--- a/javascript/ql/test/library-tests/frameworks/data/test.js
+++ b/javascript/ql/test/library-tests/frameworks/data/test.js
@@ -272,3 +272,9 @@ class MySubclass2 extends MySubclass {
 sink(new MySubclass2().baseclassSource()); // NOT OK
 
 sink(testlib.parenthesizedPackageName()); // NOT OK
+
+function dangerConstant() {
+  sink("danger-constant".danger); // NOT OK
+  sink("danger-constant".safe); // OK
+  sink("danger-constant"); // OK
+}
diff --git a/javascript/ql/test/library-tests/frameworks/data/test.ql b/javascript/ql/test/library-tests/frameworks/data/test.ql
index 24af57cb14d..cca38c28642 100644
--- a/javascript/ql/test/library-tests/frameworks/data/test.ql
+++ b/javascript/ql/test/library-tests/frameworks/data/test.ql
@@ -2,6 +2,15 @@ import javascript
 import testUtilities.ConsistencyChecking
 import semmle.javascript.frameworks.data.internal.ApiGraphModels as ApiGraphModels
 
+class TypeModelFromCodeQL extends ModelInput::TypeModel {
+  override predicate isTypeUsed(string type) { type = "danger-constant" }
+
+  override DataFlow::Node getASource(string type) {
+    type = "danger-constant" and
+    result.getStringValue() = "danger-constant"
+  }
+}
+
 class BasicTaintTracking extends TaintTracking::Configuration {
   BasicTaintTracking() { this = "BasicTaintTracking" }
 
diff --git a/python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPublic.qll b/python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPublic.qll
index 4192241d619..a3075dc4be3 100644
--- a/python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPublic.qll
+++ b/python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPublic.qll
@@ -9,6 +9,7 @@ import Attributes
 import LocalSources
 private import semmle.python.essa.SsaCompute
 private import semmle.python.dataflow.new.internal.ImportStar
+private import semmle.python.frameworks.data.ModelsAsData
 private import FlowSummaryImpl as FlowSummaryImpl
 private import semmle.python.frameworks.data.ModelsAsData
 
@@ -125,6 +126,13 @@ newtype TNode =
     f = any(VariableCapture::CapturedVariable v).getACapturingScope() and
     // TODO: Remove this restriction when adding proper support for captured variables in the body of the function we generate for comprehensions
     exists(TFunction(f))
+  } or
+  /** An empty, unused node type that exists to prevent unwanted dependencies on data flow nodes. */
+  TForbiddenRecursionGuard() {
+    none() and
+    // We want to prune irrelevant models before materialising data flow nodes, so types contributed
+    // directly from CodeQL must expose their pruning info without depending on data flow nodes.
+    (any(ModelInput::TypeModel tm).isTypeUsed("") implies any())
   }
 
 private import semmle.python.internal.CachedStages
diff --git a/python/ql/lib/semmle/python/frameworks/data/internal/ApiGraphModels.qll b/python/ql/lib/semmle/python/frameworks/data/internal/ApiGraphModels.qll
index b850a4acea0..7215bd71550 100644
--- a/python/ql/lib/semmle/python/frameworks/data/internal/ApiGraphModels.qll
+++ b/python/ql/lib/semmle/python/frameworks/data/internal/ApiGraphModels.qll
@@ -168,9 +168,20 @@ module ModelInput {
    * A unit class for adding additional type model rows from CodeQL models.
    */
   class TypeModel extends Unit {
+    /**
+     * Holds if any of the other predicates in this class might have a result
+     * for the given `type`.
+     *
+     * The implementation of this predicate should not depend on `DataFlow::Node`.
+     */
+    bindingset[type]
+    predicate isTypeUsed(string type) { none() }
+
     /**
      * Gets a data-flow node that is a source of the given `type`.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * This must not depend on API graphs, but ensures that an API node is generated for
      * the source.
      */
@@ -180,6 +191,8 @@ module ModelInput {
      * Gets a data-flow node that is a sink of the given `type`,
      * usually because it is an argument passed to a parameter of that type.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * This must not depend on API graphs, but ensures that an API node is generated for
      * the sink.
      */
@@ -188,6 +201,8 @@ module ModelInput {
     /**
      * Gets an API node that is a source or sink of the given `type`.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * Unlike `getASource` and `getASink`, this may depend on API graphs.
      */
     API::Node getAnApiNode(string type) { none() }
@@ -367,6 +382,8 @@ predicate isRelevantType(string type) {
   (
     Specific::isTypeUsed(type)
     or
+    any(TypeModel model).isTypeUsed(type)
+    or
     exists(TestAllModels t)
   )
   or
diff --git a/ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPrivate.qll b/ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPrivate.qll
index b5e412e9d07..edab51da858 100644
--- a/ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPrivate.qll
+++ b/ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPrivate.qll
@@ -588,7 +588,13 @@ private module Cached {
       n in [-1 .. 10] and
       splatPos = unique(int i | splatArgumentAt(c, i) and i > 0)
     } or
-    TCaptureNode(VariableCapture::Flow::SynthesizedCaptureNode cn)
+    TCaptureNode(VariableCapture::Flow::SynthesizedCaptureNode cn) or
+    TForbiddenRecursionGuard() {
+      none() and
+      // We want to prune irrelevant models before materialising data flow nodes, so types contributed
+      // directly from CodeQL must expose their pruning info without depending on data flow nodes.
+      (any(ModelInput::TypeModel tm).isTypeUsed("") implies any())
+    }
 
   class TSelfParameterNode = TSelfMethodParameterNode or TSelfToplevelParameterNode;
 
diff --git a/ruby/ql/lib/codeql/ruby/frameworks/data/internal/ApiGraphModels.qll b/ruby/ql/lib/codeql/ruby/frameworks/data/internal/ApiGraphModels.qll
index b850a4acea0..7215bd71550 100644
--- a/ruby/ql/lib/codeql/ruby/frameworks/data/internal/ApiGraphModels.qll
+++ b/ruby/ql/lib/codeql/ruby/frameworks/data/internal/ApiGraphModels.qll
@@ -168,9 +168,20 @@ module ModelInput {
    * A unit class for adding additional type model rows from CodeQL models.
    */
   class TypeModel extends Unit {
+    /**
+     * Holds if any of the other predicates in this class might have a result
+     * for the given `type`.
+     *
+     * The implementation of this predicate should not depend on `DataFlow::Node`.
+     */
+    bindingset[type]
+    predicate isTypeUsed(string type) { none() }
+
     /**
      * Gets a data-flow node that is a source of the given `type`.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * This must not depend on API graphs, but ensures that an API node is generated for
      * the source.
      */
@@ -180,6 +191,8 @@ module ModelInput {
      * Gets a data-flow node that is a sink of the given `type`,
      * usually because it is an argument passed to a parameter of that type.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * This must not depend on API graphs, but ensures that an API node is generated for
      * the sink.
      */
@@ -188,6 +201,8 @@ module ModelInput {
     /**
      * Gets an API node that is a source or sink of the given `type`.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * Unlike `getASource` and `getASink`, this may depend on API graphs.
      */
     API::Node getAnApiNode(string type) { none() }
@@ -367,6 +382,8 @@ predicate isRelevantType(string type) {
   (
     Specific::isTypeUsed(type)
     or
+    any(TypeModel model).isTypeUsed(type)
+    or
     exists(TestAllModels t)
   )
   or