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+/* Copyright 2014 matrix.org
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+-- Stores pdus and their content
+CREATE TABLE IF NOT EXISTS pdus(
+    pdu_id TEXT, 
+    origin TEXT, 
+    context TEXT,
+    pdu_type TEXT,
+    ts INTEGER,
+    depth INTEGER DEFAULT 0 NOT NULL,
+    is_state BOOL, 
+    content_json TEXT,
+    unrecognized_keys TEXT,
+    outlier BOOL NOT NULL,
+    have_processed BOOL, 
+    CONSTRAINT pdu_id_origin UNIQUE (pdu_id, origin)
+);
+
+-- Stores what the current state pdu is for a given (context, pdu_type, key) tuple
+CREATE TABLE IF NOT EXISTS state_pdus(
+    pdu_id TEXT,
+    origin TEXT,
+    context TEXT,
+    pdu_type TEXT,
+    state_key TEXT,
+    power_level TEXT,
+    prev_state_id TEXT,
+    prev_state_origin TEXT,
+    CONSTRAINT pdu_id_origin UNIQUE (pdu_id, origin)
+    CONSTRAINT prev_pdu_id_origin UNIQUE (prev_state_id, prev_state_origin)
+);
+
+CREATE TABLE IF NOT EXISTS current_state(
+    pdu_id TEXT,
+    origin TEXT,
+    context TEXT,
+    pdu_type TEXT,
+    state_key TEXT,
+    CONSTRAINT pdu_id_origin UNIQUE (pdu_id, origin)
+    CONSTRAINT uniqueness UNIQUE (context, pdu_type, state_key) ON CONFLICT REPLACE
+);
+
+-- Stores where each pdu we want to send should be sent and the delivery status.
+create TABLE IF NOT EXISTS pdu_destinations(
+    pdu_id TEXT,
+    origin TEXT,
+    destination TEXT,
+    delivered_ts INTEGER DEFAULT 0, -- or 0 if not delivered
+    CONSTRAINT uniqueness UNIQUE (pdu_id, origin, destination) ON CONFLICT REPLACE
+);
+
+CREATE TABLE IF NOT EXISTS pdu_forward_extremities(
+    pdu_id TEXT,
+    origin TEXT,
+    context TEXT,
+    CONSTRAINT uniqueness UNIQUE (pdu_id, origin, context) ON CONFLICT REPLACE
+);
+
+CREATE TABLE IF NOT EXISTS pdu_backward_extremities(
+    pdu_id TEXT,
+    origin TEXT,
+    context TEXT,
+    CONSTRAINT uniqueness UNIQUE (pdu_id, origin, context) ON CONFLICT REPLACE
+);
+
+CREATE TABLE IF NOT EXISTS pdu_edges(
+    pdu_id TEXT,
+    origin TEXT,
+    prev_pdu_id TEXT,
+    prev_origin TEXT,
+    context TEXT,
+    CONSTRAINT uniqueness UNIQUE (pdu_id, origin, prev_pdu_id, prev_origin, context)
+);
+
+CREATE TABLE IF NOT EXISTS context_depth(
+    context TEXT,
+    min_depth INTEGER,
+    CONSTRAINT uniqueness UNIQUE (context)
+);
+
+CREATE INDEX IF NOT EXISTS context_depth_context ON context_depth(context);
+
+
+CREATE INDEX IF NOT EXISTS pdu_id ON pdus(pdu_id, origin);
+
+CREATE INDEX IF NOT EXISTS dests_id ON pdu_destinations (pdu_id, origin);
+-- CREATE INDEX IF NOT EXISTS dests ON pdu_destinations (destination);
+
+CREATE INDEX IF NOT EXISTS pdu_extrem_context ON pdu_forward_extremities(context);
+CREATE INDEX IF NOT EXISTS pdu_extrem_id ON pdu_forward_extremities(pdu_id, origin);
+
+CREATE INDEX IF NOT EXISTS pdu_edges_id ON pdu_edges(pdu_id, origin);
+
+CREATE INDEX IF NOT EXISTS pdu_b_extrem_context ON pdu_backward_extremities(context);