docs: add SHOW CONSTANT VALUES and catalog tables to all docs

Update help topics, quick reference, language reference, site docs
(catalog schema, show-constants, show-settings), and project-settings
skill to document the new SHOW CONSTANT VALUES command and
CATALOG.CONSTANTS / CATALOG.CONSTANT_VALUES tables.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ako

.claude/skills/mendix/project-settings.md

@@ -57,6 +57,10 @@ ALTER SETTINGS CONFIGURATION 'Default'
 ### Constant Overrides
 
 ```sql
+-- View constant values across all configurations
+SHOW CONSTANT VALUES;
+SHOW CONSTANT VALUES IN MyModule;    -- Filter by module
+
 -- Override a constant value in a configuration
 ALTER SETTINGS CONSTANT 'BusinessEvents.ServerUrl' VALUE 'kafka:9092'
   IN CONFIGURATION 'Default';

cmd/mxcli/help_topics/constant.txt

@@ -20,6 +20,10 @@ Show constants:
   SHOW CONSTANTS;                    -- All constants
   SHOW CONSTANTS IN MyModule;        -- Filter by module
 
+Show constant values across configurations:
+  SHOW CONSTANT VALUES;              -- All constants with per-config overrides
+  SHOW CONSTANT VALUES IN MyModule;  -- Filter by module
+
 Describe a constant:
   DESCRIBE CONSTANT Module.Name;
 

docs-site/src/internals/catalog-schema.md

@@ -88,6 +88,35 @@ CREATE TABLE ENUMERATIONS (
 );
 ```
 
+### CONSTANTS
+
+```sql
+CREATE TABLE CONSTANTS (
+    Id              TEXT PRIMARY KEY,
+    Name            TEXT,
+    QualifiedName   TEXT,
+    ModuleName      TEXT,
+    Folder          TEXT,
+    Description     TEXT,
+    DataType        TEXT,               -- String, Integer, Boolean, etc.
+    DefaultValue    TEXT,
+    ExposedToClient INTEGER DEFAULT 0
+);
+```
+
+### CONSTANT_VALUES
+
+Per-configuration constant overrides. Join with `CONSTANTS` on `ConstantName = QualifiedName`.
+
+```sql
+CREATE TABLE CONSTANT_VALUES (
+    Id                INTEGER PRIMARY KEY AUTOINCREMENT,
+    ConstantName      TEXT NOT NULL,     -- Qualified: Module.Constant
+    ConfigurationName TEXT NOT NULL,     -- e.g., "Default", "Production"
+    Value             TEXT
+);
+```
+
 ### WORKFLOWS
 
 ```sql
@@ -189,4 +218,14 @@ WHERE TargetName = 'Sales.Customer';
 -- Full-text search
 SELECT name, kind, snippet(STRINGS, 2, '<b>', '</b>', '...', 20)
 FROM CATALOG.STRINGS WHERE strings MATCH 'validation error';
+
+-- Find constants exposed to client
+SELECT QualifiedName, DataType, DefaultValue FROM CATALOG.CONSTANTS
+WHERE ExposedToClient = 1;
+
+-- Compare constant values across configurations
+SELECT c.QualifiedName, cv.ConfigurationName, cv.Value
+FROM CATALOG.CONSTANTS c
+JOIN CATALOG.CONSTANT_VALUES cv ON c.QualifiedName = cv.ConstantName
+ORDER BY c.QualifiedName, cv.ConfigurationName;
 ```

docs-site/src/internals/catalog.md

@@ -63,6 +63,8 @@ LIMIT 10;
 | `PAGES` | Page names, layouts, URLs | `REFRESH CATALOG` |
 | `SNIPPETS` | Snippet names | `REFRESH CATALOG` |
 | `ENUMERATIONS` | Enumeration names and value counts | `REFRESH CATALOG` |
+| `CONSTANTS` | Constant names, types, default values | `REFRESH CATALOG` |
+| `CONSTANT_VALUES` | Per-configuration constant overrides | `REFRESH CATALOG` |
 | `WORKFLOWS` | Workflow names and activity counts | `REFRESH CATALOG` |
 | `ACTIVITIES` | Individual microflow activities | `REFRESH CATALOG FULL` |
 | `WIDGETS` | Widget instances across all pages | `REFRESH CATALOG FULL` |

docs-site/src/reference/query/show-constants.md

@@ -4,12 +4,16 @@
 
     SHOW CONSTANTS [IN <module>]
 
+    SHOW CONSTANT VALUES [IN <module>]
+
 ## Description
 
 Lists constants defined in the project. Without the `IN` clause, lists all constants across all modules. With `IN <module>`, restricts the listing to constants in the specified module.
 
 Constants are named values (strings, integers, booleans, etc.) that can be configured per deployment environment. They are typically used for API URLs, feature flags, and configuration values.
 
+`SHOW CONSTANT VALUES` shows one row per constant per configuration, making it easy to compare constant overrides across configurations (e.g., Default, Acceptance, Production). Each constant's default value is shown first, followed by any per-configuration overrides.
+
 ## Parameters
 
 *module*
@@ -29,6 +33,18 @@ List constants in a specific module:
 SHOW CONSTANTS IN MyModule
 ```
 
+Compare constant values across all configurations:
+
+```sql
+SHOW CONSTANT VALUES
+```
+
+Compare constant values for a specific module:
+
+```sql
+SHOW CONSTANT VALUES IN MyModule
+```
+
 ## See Also
 
-[SHOW MODULES](show-modules.md), [SHOW STRUCTURE](show-structure.md)
+[SHOW MODULES](show-modules.md), [SHOW STRUCTURE](show-structure.md), [SHOW / DESCRIBE SETTINGS](../settings/show-settings.md)

docs-site/src/reference/settings/show-settings.md

@@ -61,4 +61,4 @@ DESCRIBE SETTINGS WORKFLOWS;
 
 ## See Also
 
-[ALTER SETTINGS](alter-settings.md)
+[ALTER SETTINGS](alter-settings.md), [SHOW CONSTANT VALUES](../query/show-constants.md)

docs/01-project/MDL_QUICK_REFERENCE.md

@@ -67,6 +67,7 @@ ALTER ENTITY Sales.Customer
 | Statement | Syntax | Notes |
 |-----------|--------|-------|
 | Show constants | `SHOW CONSTANTS [IN Module];` | List all or filter by module |
+| Show constant values | `SHOW CONSTANT VALUES [IN Module];` | Compare values across configurations |
 | Describe constant | `DESCRIBE CONSTANT Module.Name;` | Full MDL output |
 | Create constant | `CREATE [OR MODIFY] CONSTANT Module.Name TYPE DataType DEFAULT 'value';` | String, Integer, Boolean, etc. |
 | Drop constant | `DROP CONSTANT Module.Name;` | |

docs/05-mdl-specification/01-language-reference.md

@@ -1163,6 +1163,14 @@ SHOW SETTINGS              -- Overview of all settings
 DESCRIBE SETTINGS           -- Full MDL output (round-trippable)
 ```
 
+### SHOW CONSTANT VALUES
+
+```sql
+SHOW CONSTANT VALUES [IN Module]   -- Compare constant values across configurations
+```
+
+Displays one row per constant per configuration. Shows the default value followed by any per-configuration overrides.
+
 ### ALTER SETTINGS
 
 ```sql
@@ -1178,6 +1186,9 @@ ALTER SETTINGS WORKFLOWS Key = Value;
 ALTER SETTINGS MODEL AfterStartupMicroflow = 'MyModule.ACT_Startup';
 ALTER SETTINGS CONFIGURATION 'default' DatabaseType = 'POSTGRESQL';
 ALTER SETTINGS LANGUAGE DefaultLanguageCode = 'en_US';
+
+-- View constant values across all configurations
+SHOW CONSTANT VALUES;
 ```
 
 ---