create new graph definitions (will replace cybergraph)

pgsql/graph/drop.sql

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+-- storage-common/qgsql/graph/drop.sql
+
+drop table steps;
+drop sequence steps_id_seq;

pgsql/graph/load_basic.sql

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+-- storage-common/qgsql/graph/load_basic.sql
+-- load bootstrap and basic semantic steps
+
+-- basic concepts with fixed IDs
+insert into steps (id, item, property, valtype, numval, strval) values 
+    (1, 1, 2, 3, 1, null),          -- this: this is this
+    (2, 1, 2, 3, 2, null),          -- is: this is is
+    (3, 1, 2, 3, 3, null),          -- Class: this is Class
+    (4, 1, 2, 3, 4, null),          -- type: this is type
+    (5, 1, 2, 3, 5, null),          -- Property: this is Property
+    (6, 1, 2, 3, 6, null);          -- name: this is name
+
+-- basic types and names
+insert into steps (item, property, valtype, numval, strval) values 
+    (3, 4, 3, 3, null),             -- Class type Class
+    (5, 4, 3, 3, null),             -- property type Class
+    (4, 4, 3, 5, null),             -- type type Property
+    (6, 4, 3, 5, null),             -- name type Property
+    (1, 6, 1, null, 'this'),        -- this name "this"
+    (2, 6, 1, null, 'is'),          -- is name "is"
+    (4, 6, 1, null, 'type'),        -- type name "type"
+    (3, 6, 1, null, 'Class'),       -- Class name "Class"
+    (5, 6, 1, null, 'Property'),    -- Property name "Property"
+    (6, 6, 1, null, 'name');        -- name name "name"

pgsql/graph/tables.sql

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+-- storage-common/qgsql/graph/tables.sql
+-- a simple generic RDF-like graph storage using only one tabel
+
+create sequence steps_id_seq start with 11;  
+-- note: bootstrap rows get explicit IDs
+
+create table steps (
+    id bigint not null primary key default nextval('steps_id_seq'),
+    item bigint not null,
+    property bigint not null references steps,
+    valtype smallint not null check (valtype in (0, 1, 2, 3)),
+    -- 0 = Nothing, 1 = Text, 2 = Number, 3 = Step
+    numval bigint, -- null except for valtype 2 and 3
+    strval text    -- null except for valtype 1
+);
+
+-- indexes
+
+create index idx_ipv on steps USING btree (item, property, valtype, numval, strval);
+create index idx_pv on steps using btree (property, valtype, numval, strval);
+
+-- optional, not used (values make only sense together with a property):
+--create index idx_vi on steps using btree (valtype, numval, strval, item);