feat: firebird FKs, PKs, procedures, funcs

plugins/dbgate-plugin-firebird/src/backend/sql/primaryKeys.js

@@ -0,0 +1,29 @@
+module.exports = `
+SELECT
+    TRIM(rel.RDB$OWNER_NAME) AS "schemaName",
+    TRIM(rc.RDB$RELATION_NAME) AS "pureName",
+    TRIM(rc.RDB$CONSTRAINT_NAME) AS "constraintName",
+    TRIM(iseg.RDB$FIELD_NAME) AS "columnName",
+    CAST(NULL AS VARCHAR(63)) AS "refColumnName",
+    FALSE AS "isIncludedColumn",
+    CASE COALESCE(idx.RDB$INDEX_TYPE, 0) -- Treat NULL as 0 (ascending)
+        WHEN 1 THEN TRUE  -- Assuming 1 means DESCENDING for regular (non-expression) indexes
+        ELSE FALSE        -- Assuming 0 (or NULL) means ASCENDING for regular indexes
+    END AS "isDescending"
+FROM
+    RDB$RELATION_CONSTRAINTS rc
+JOIN
+    RDB$RELATIONS rel ON rc.RDB$RELATION_NAME = rel.RDB$RELATION_NAME
+JOIN
+    RDB$INDICES idx ON rc.RDB$INDEX_NAME = idx.RDB$INDEX_NAME
+JOIN
+    RDB$INDEX_SEGMENTS iseg ON idx.RDB$INDEX_NAME = iseg.RDB$INDEX_NAME
+WHERE
+    rc.RDB$CONSTRAINT_TYPE = 'PRIMARY KEY'
+    AND COALESCE(rel.RDB$SYSTEM_FLAG, 0) = 0 -- Typically, you only want user-defined tables
+ORDER BY
+    "schemaName",
+    "pureName",
+    "constraintName",
+    iseg.RDB$FIELD_POSITION;
+`;