Try the simplest flask cache possible.

app/__init__.py

@@ -15,11 +15,16 @@
 import bleach
 import os
 from flask import Flask
+from flask_caching import Cache
 from flaskext.markdown import Markdown
 from markdown.extensions.wikilinks import WikiLinkExtension
 from . import util
 from flask_cors import CORS
 
+cache = Cache()
+
+# what is this doing here, I have no idea.
+# todo: move to util.
 def wikilink_to_url(label, base, end):
     label = util.canonical_wikilink(label)
     url = '/node/' + label
@@ -30,8 +35,12 @@ def create_app(test_config=None):
     app = Flask(__name__, instance_relative_config=True)
     app.config.from_mapping(
         SECRET_KEY='dev',
+	DEBUG=True,          # some Flask specific configs
+	CACHE_TYPE="SimpleCache",  # Flask-Caching related configs
+	CACHE_DEFAULT_TIMEOUT=30
     )
     CORS(app)
+    cache.init_app(app, config={'CACHE_TYPE': 'SimpleCache', 'CACHE_DEFAULT_TIMEOUT': 30})
 
     if test_config is None:
         # load the instance config, if it exists, when not testing

app/db.py

@@ -12,12 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import cachetools.func
 import glob
 import itertools
 import re
 import os
 from flask import current_app
+from . import cache
 from . import config
 from . import feed
 from . import render
@@ -80,7 +80,7 @@ class Graph:
         nodes = [node for node in G.nodes() if node.wikilink in permutations and node.subnodes]
         return nodes
 
-    @cachetools.func.ttl_cache(maxsize=2, ttl=20)
+    @cache.memoize(timeout=30)
     def nodes(self, include_journals=True):
         current_app.logger.debug('Loading graph.')
         # returns a list of all nodes
@@ -112,7 +112,7 @@ class Graph:
     # Running something like this would be ideal eventually though.
     # It might also work better once all pulling/pushing logic moves to Graph, where it belongs, 
     # and can make use of more sensible algorithms.
-    @cachetools.func.ttl_cache(maxsize=2, ttl=20)
+    @cache.memoize(timeout=30)
     def compute_transclusion(self, include_journals=True):
 
         # Add artisanal virtual subnodes (resulting from transclusion/[[push]]) to all nodes.
@@ -121,7 +121,7 @@ class Graph:
             node.subnodes.extend(pushed_subnodes)
 
     # does this belong here?
-    @cachetools.func.ttl_cache(maxsize=1, ttl=20)
+    @cache.memoize(timeout=30)
     def subnodes(self, sort=lambda x: x.uri.lower()):
         # Markdown.
         subnodes = [Subnode(f) for f in glob.glob(os.path.join(config.AGORA_PATH, '**/*.md'), recursive=True)]

requirements.txt

@@ -5,6 +5,7 @@ dateparser==1.0.0
 feedparser==6.0.2
 filetype==1.0.7
 Flask==1.1.2
+Flask-Caching==1.10.0
 Flask-Cors==3.0.10
 Flask-Markdown==0.3
 Flask-WTF==0.14.3