chore: move the go code into a subfolder

apps/api/cmd/initialise/sql/08_events_table.sql

@@ -0,0 +1,121 @@
+CREATE TABLE IF NOT EXISTS eventstore.events2 (
+    instance_id TEXT NOT NULL
+    , aggregate_type TEXT NOT NULL
+    , aggregate_id TEXT NOT NULL
+    
+    , event_type TEXT NOT NULL
+    , "sequence" BIGINT NOT NULL
+    , revision SMALLINT NOT NULL
+    , created_at TIMESTAMPTZ NOT NULL
+    , payload JSONB
+    , creator TEXT NOT NULL
+    , "owner" TEXT NOT NULL
+    
+    , "position" DECIMAL NOT NULL
+    , in_tx_order INTEGER NOT NULL
+
+    , PRIMARY KEY (instance_id, aggregate_type, aggregate_id, "sequence")
+);
+
+CREATE INDEX IF NOT EXISTS es_active_instances ON eventstore.events2 (created_at DESC, instance_id);
+CREATE INDEX IF NOT EXISTS es_wm ON eventstore.events2 (aggregate_id, instance_id, aggregate_type, event_type);
+CREATE INDEX IF NOT EXISTS es_projection ON eventstore.events2 (instance_id, aggregate_type, event_type, "position");
+
+-- represents an event to be created.
+DO $$ BEGIN
+    CREATE TYPE eventstore.command AS (
+        instance_id TEXT
+        , aggregate_type TEXT
+        , aggregate_id TEXT
+        , command_type TEXT
+        , revision INT2
+        , payload JSONB
+        , creator TEXT
+        , owner TEXT
+    );
+EXCEPTION
+    WHEN duplicate_object THEN null;
+END $$;
+
+CREATE OR REPLACE FUNCTION eventstore.commands_to_events(commands eventstore.command[]) RETURNS SETOF eventstore.events2 VOLATILE AS $$
+SELECT
+    c.instance_id
+    , c.aggregate_type
+    , c.aggregate_id
+    , c.command_type AS event_type
+    , cs.sequence + ROW_NUMBER() OVER (PARTITION BY c.instance_id, c.aggregate_type, c.aggregate_id ORDER BY c.in_tx_order) AS sequence
+    , c.revision
+    , NOW() AS created_at
+    , c.payload
+    , c.creator
+    , cs.owner
+    , EXTRACT(EPOCH FROM NOW()) AS position
+    , c.in_tx_order
+FROM (
+    SELECT
+        c.instance_id
+        , c.aggregate_type
+        , c.aggregate_id
+        , c.command_type
+        , c.revision
+        , c.payload
+        , c.creator
+        , c.owner
+        , ROW_NUMBER() OVER () AS in_tx_order
+    FROM
+        UNNEST(commands) AS c
+) AS c
+JOIN (
+    SELECT
+        cmds.instance_id
+        , cmds.aggregate_type
+        , cmds.aggregate_id
+        , CASE WHEN (e.owner IS NOT NULL OR e.owner <> '') THEN e.owner ELSE command_owners.owner END AS owner
+        , COALESCE(MAX(e.sequence), 0) AS sequence
+    FROM (
+        SELECT DISTINCT
+            instance_id
+            , aggregate_type
+            , aggregate_id
+            , owner
+        FROM UNNEST(commands)
+    ) AS cmds
+    LEFT JOIN eventstore.events2 AS e
+        ON cmds.instance_id = e.instance_id
+        AND cmds.aggregate_type = e.aggregate_type
+        AND cmds.aggregate_id = e.aggregate_id
+    JOIN (
+        SELECT
+            DISTINCT ON (
+                instance_id
+                , aggregate_type
+                , aggregate_id
+            )
+            instance_id
+            , aggregate_type
+            , aggregate_id
+            , owner
+        FROM
+            UNNEST(commands)
+    ) AS command_owners ON
+        cmds.instance_id = command_owners.instance_id
+        AND cmds.aggregate_type = command_owners.aggregate_type
+        AND cmds.aggregate_id = command_owners.aggregate_id
+    GROUP BY
+        cmds.instance_id
+        , cmds.aggregate_type
+        , cmds.aggregate_id
+        , 4 -- owner
+) AS cs
+    ON c.instance_id = cs.instance_id
+    AND c.aggregate_type = cs.aggregate_type
+    AND c.aggregate_id = cs.aggregate_id
+ORDER BY
+    in_tx_order;
+$$ LANGUAGE SQL;
+
+CREATE OR REPLACE FUNCTION eventstore.push(commands eventstore.command[]) RETURNS SETOF eventstore.events2 VOLATILE AS $$
+INSERT INTO eventstore.events2
+SELECT * FROM eventstore.commands_to_events(commands)
+RETURNING *
+$$ LANGUAGE SQL;