feat: introduce configurable future partition buffer and add monitoring for future partitions.

postgresql/procedures/00_partitions_init.sql

@@ -11,6 +11,7 @@ CREATE TABLE IF NOT EXISTS partitions.config (
     table_name      text NOT NULL,
     period          text NOT NULL CHECK (period IN ('day', 'week', 'month', 'year')),
     keep_history    interval NOT NULL,
+    future_partitions integer NOT NULL DEFAULT 5,
     last_updated    timestamp WITH TIME ZONE DEFAULT now(),
     PRIMARY KEY (table_name)
 );

postgresql/procedures/02_maintenance.sql

@@ -105,7 +105,8 @@ $$;
 CREATE OR REPLACE PROCEDURE partitions.maintain_table(
     p_table_name text,
     p_period text,
-    p_keep_history interval
+    p_keep_history interval,
+    p_future_partitions integer DEFAULT 5
 ) LANGUAGE plpgsql AS $$
 DECLARE
     v_start_time timestamp with time zone;
@@ -139,8 +140,8 @@ BEGIN
         RETURN;
     END IF;
 
-    -- 1. Create Future Partitions (Current + 3 ahead)
-    FOR i IN 0..3 LOOP
+    -- 1. Create Future Partitions (Current + Buffer)
+    FOR i IN 0..p_future_partitions LOOP
         CALL partitions.create_partition(
             p_table_name,
             v_start_time + (i * v_period_interval),
@@ -176,7 +177,7 @@ DECLARE
     v_row record;
 BEGIN
     FOR v_row IN SELECT * FROM partitions.config LOOP
-        CALL partitions.maintain_table(v_row.table_name, v_row.period, v_row.keep_history);
+        CALL partitions.maintain_table(v_row.table_name, v_row.period, v_row.keep_history, v_row.future_partitions);
     END LOOP;
 END;
 $$;

postgresql/procedures/03_enable_partitioning.sql

@@ -27,9 +27,9 @@ BEGIN
             
             -- 3. Create initial partitions
             RAISE NOTICE 'Creating initial partitions for %...', v_table;
-            CALL partitions.maintain_table(v_table, v_row.period, v_row.keep_history); 
+            CALL partitions.maintain_table(v_table, v_row.period, v_row.keep_history, v_row.future_partitions); 
             
-            -- 4. (Optional) Copy data?
+            -- Optional: Migrate existing data
             -- EXECUTE format('INSERT INTO public.%I SELECT * FROM public.%I', v_table, v_old_table);
             
         ELSIF EXISTS (SELECT 1 FROM pg_class WHERE relname = v_table AND relkind = 'p') THEN

postgresql/procedures/04_monitoring_view.sql

@@ -10,6 +10,12 @@ SELECT
     c.period,
     c.keep_history,
     count(child.relname) AS partition_count,
+    count(child.relname) FILTER (
+        WHERE
+           (c.period = 'day' AND child.relname > (parent.relname || '_p' || to_char(now(), 'YYYYMMDD')))
+           OR
+           (c.period = 'month' AND child.relname > (parent.relname || '_p' || to_char(now(), 'YYYYMM')))
+    ) AS future_partitions,
     pg_size_pretty(sum(pg_total_relation_size(child.oid))) AS total_size,
     min(child.relname) AS oldest_partition,
     max(child.relname) AS newest_partition,